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Use this page to learn how to make a Cookie Monster cake, an adorable Sesame Street-themed homemade chocolate chip birthday cake. I love this decorating method because it’s pretty easy, even if you’re a cake decorating beginner. You don’t need any fondant or special molding ingredients for Cookie’s eyes and mouth. My video tutorial for Elmo Cake will be helpful because we are essentially doing the same thing, only without a nose!

homemade decorated cookie monster cake on wooden cake stand.

For my oldest’s 2nd birthday, I made an Elmo cake, so it seemed very appropriate—necessary, even—to make a Cookie Monster cake for my youngest’s 2nd birthday! Her older sister loves Elmo, so Cookie Monster has naturally become a favorite character around here.

I’m not an advanced cake decorator. While I’ve improved with dedicated practice over the years, you won’t see me making super elaborate cake designs—a naked cake is more my speed! However, this is a surprisingly simple cake to decorate. The hardest part is the tedious task of piping all of Cookie Monster’s fur, so take a few breaks to give your hand a rest.

chocolate chip layer cake with blue frosting.

Chocolate Chips Galore Your Monsters Will Adore!

C is for cookies. And cake. And chocolate chips.

This cake is so much fun because it includes chocolate chips inside, and it also includes chocolate chip cookies outside. [Monster voice] COOOOKIEEES. I made a batch of mini chocolate chip cookies using my recipe for mini M&M cookies, just subbing mini chocolate chips for the mini M&Ms. These are perfect for adding around the Cookie Monster cake, and also perfect for little cookie monsters to eat!

If you want to make full-size cookies for your Cookie Monster cake to be “eating,” you can really choose any of your favorite cookie recipes. I made these chewy chocolate chip cookies. I think he liked them. [Nom nom nom nom]

Make a 2-Layer Round Cake

The focus of this cake is the top (as opposed to the sides), so I opted for a shorter 2-layer cake. (Also, the taller the cake, the more piping you need to do!) My 2-layer white cake recipe promises a soft and flavorful cake with the fluffiest texture. It’s always a hit, especially for birthday parties. This time, I added mini chocolate chips to the cake batter, and all I have to say is YUM.

chocolate chip cake batter in glass bowl.
two round 9-inch chocolate chip cakes in cake pans.

Cool, then level the cakes: The baked cakes will have a slight dome, so carefully level them off with a cake leveler or serrated knife. **Save the scraps because they will be used for Cookie Monster’s eyes.**

two round 9-inch chocolate chip cakes leveled off.

How to Decorate Cookie Monster Cake

Now that you have your cakes ready, let’s begin to assemble and decorate.

  1. Make the Frosting: I used my favorite vanilla buttercream and increased the ratio so I had more frosting to work with. I highly recommend following the frosting recipe below. Tint most of the frosting blue for Cookie Monster’s fur. Then tint some frosting black for his mouth and pupils and leave the rest white for the cake’s filling. I recommend gel food coloring, not liquid, to preserve the consistency of the frosting. I used Americolor gel food coloring in Royal Blue. Keep in mind the frosting will dry slightly darker than it looks when you’re mixing it. If you’d like to use natural food coloring, I like the brand Supernatural; they have some powdered food coloring that works well in frosting.
  2. Layer the Cakes: Layer the two cakes together on your cake stand, serving plate, or cake turntable and spread 1 cup of untinted frosting between the two.
  3. Add Crumb Coat: Apply a thin layer of blue frosting around the sides and on top of the cake. A bench scraper, icing spatula, and cake turntable are helpful. The crumb coat creates a helpful flat “base” of frosting for the piped fur decoration. Chill the crumb-coated cake as you make his eyes.
  4. Form Cookie Monster’s Eyes: Remember the cake tops you leveled off? Crumble them up cake pops style. Mix with a little frosting and form into 2 disc-like circles. Freeze until solid, about 30 minutes then coat in melted white chocolate. See in-depth instructions on making Cookie’s eyes below.
  5. Add Mouth & Pipe Fur: With a small offset spatula, spread a thin layer of black on top for Cookie Monster’s mouth, then use a toothpick to trace out its exact shape. Now let’s begin piping! You need a grass tip, such as Wilton piping tip 233 or Wilton piping tip 234. In order for the fur to hold its piped shape, the frosting must be relatively thick, so make sure you follow my recipe below.
  6. Finishing Touches: Finish the eyes (see below), and place them on top of the cake. Add some cookies around the cake, and a broken one in his mouth, and your Cookie Monster cake is done!

Let’s see those decorating steps come together. Most of the frosting is tinted blue, then tint some black and leave the rest untinted:

1 large bowl of blue frosting, 1 small bowl of black frosting, and 1 small bowl of white (untinted) frosting.

Layer the cooled and leveled-off cakes together with untinted buttercream between them. Use some of the blue frosting to apply a very thin crumb coat:

blue crumb coated cake on wooden cake stand.

The crumb coated-cake must chill for at least 30 minutes to help set the cake, so start Cookie Monster’s eyes while you wait.

How to Make Cookie Monster’s Eyes

You don’t need anything extra like rolled fondant or modeling chocolate to shape Cookie Monster’s googly eyes. Rather, simply use the scraps of cake that you leveled off, mixed with some of the white (untinted) buttercream frosting. Then we’ll coat them in melted white chocolate. We’re basically making 2 cake pops, sans sticks. My taste testers actually thought the eyes were exceptionally delicious, which is a little bit creepy, but there you have it.

Shaping Tip: Only add enough frosting to the cake crumbs to yield a semi-moist mixture that you can shape into his eyes. Form into 2 disc-like circles, about 2 inches in diameter, flattened slightly. Freeze or refrigerate until solid, about 30 minutes.

chocolate chip cake crumbs mixed with frosting and shaped into flat cake pop discs.

After they’ve had a chance to solidify, melt the white chocolate. Chop up a bar of white chocolate (I like the Ghirardelli kind, found in the baking aisle), and melt in the microwave in 20-second increments, stirring after each time. Dip the eyes into the melted white chocolate until completely coated, and lift out with a fork. Place on a sheet of parchment paper and chill in the refrigerator until the coating has set.

disc shaped cake pop dipped in white chocolate.

The eyes require 2 quick rounds of chilling, so circle back to the cake as you wait. Form the mouth and pipe the fur:

applying the blue frosting "fur" on cookie monster cake.

Once the white chocolate coating on Cookie’s eyes has set, pipe the black pupils with a round piping tip—remember to make them googly— and gently press onto cake. Cookie Monster’s pupils are usually looking in opposite directions; I assume this is an adaptation that helps him spot cookies no matter which way he’s facing. LOL

homemade decorated cookie monster cake on wooden cake stand.

And here’s my Elmo Cake recipe, also perfect for cake decorating beginners:

elmo cake

Recommended Tools for Cookie Monster Cake Decoration

Today’s post is brought to you by the letter C. 😉

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homemade decorated cookie monster cake on wooden cake stand.

Cookie Monster Cake (for Decorating Beginners)

  • Author: Sally
  • Prep Time: 1 hour, 30 minutes
  • Cook Time: 26 minutes
  • Total Time: 5 hours, 30 minutes
  • Yield: serves 12 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

Description

You’ll love this method for a Cookie Monster cake because it’s delicious AND relatively easy, even if you’re a cake decorating beginner. Review the recipe and recommended tools before beginning.


Ingredients

Scale
  • 2 and 1/2 cups (285g) cake flour (spoon & leveled)
  • 2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1 teaspoon salt
  • 3/4 cup (1.5 sticks; 170g) unsalted butter, softened to room temperature
  • 1 and 3/4 cups (350g) granulated sugar
  • 5 large egg whites, at room temperature
  • 1/2 cup (120g) sour cream, at room temperature
  • 1 Tablespoon pure vanilla extract (yes, Tbsp!)
  • 3/4 cup (180ml) whole milk, at room temperature
  • 1 cup (180g) mini chocolate chips
  • 1 Tablespoon (7g) cake flour

Vanilla Buttercream

  • 1 and 1/2 cups (3 sticks; 345g) unsalted butter, softened to room temperature
  • 6 and 1/4 cups (750g) confectioners’ sugar
  • 1/3 cup (80ml) whole milk or heavy cream, at room temperature
  • 2 teaspoons pure vanilla extract
  • 1/8 teaspoon salt
  • blue and black gel food coloring

Cookie Monster’s Eyes

  • one 4-ounce white chocolate bar (113g), finely chopped*
  • 1/2 teaspoon vegetable oil or coconut oil

Instructions

  1. Read through the full directions and watch my Elmo Cake video tutorial before beginning. (Same method here, just no nose.) If you wish to make the cake ahead of time, read my Make-Ahead Instructions below before beginning.
  2. Make the cakes: Preheat oven to 350°F (177°C). Grease two 9-inch cake pans, line with parchment paper (cut 9-inch circles from parchment paper and place them in the greased pans), then grease the parchment paper. Parchment paper helps the cakes seamlessly release from the pans.
  3. Whisk the cake flour, baking powder, baking soda, and salt together. Set aside.
  4. Using a handheld or stand mixer fitted with a paddle or whisk attachment, beat the butter and sugar together on high speed until creamed, about 2 minutes. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed. Add the egg whites, sour cream, and vanilla. Beat on high speed until fully combined and mixed, about 2 minutes. Scrape down the sides and up the bottom of the bowl as needed. Pour the dry ingredients into the bowl. Then with the mixer running on low, slowly pour in the milk. Do not over-mix. You may need to whisk it all by hand to make sure there are no lumps at the bottom of the bowl. The batter will be slightly thick.
  5. Toss mini chocolate chips with 1 Tablespoon of cake flour to coat them and then fold into the batter.
  6. Pour batter evenly into cake pans. Bake for around 25-26 minutes or until the cakes are baked through. To test for doneness, insert a toothpick into the center of the cake. If it comes out clean, the cake is done. Cool cakes in the pans set on a wire rack for 30 minutes, then remove the cakes and cool completely directly on a wire rack. The cakes must be completely cool before frosting and assembling.
  7. Make the buttercream: In a large bowl using a handheld or stand mixer fitted with a paddle attachment, beat the butter on medium speed until creamy, about 2 minutes. Add confectioners’ sugar, milk/cream, vanilla extract, and salt with the mixer running on low. Increase to high speed and beat for 3 full minutes. Taste. Add a pinch of salt if frosting is way too sweet. Frosting will be thick.
  8. Tint the frosting: Place 1 cup + 2 Tablespoons (about 1 heaping cup or 275g) of frosting into a medium bowl. This will remain white/untinted and be used for the cake’s filling and to form Cookie Monster’s eyes. Place 1/3 cup (about 85g) of frosting into a small bowl. Stir in 3 drops of black gel food coloring until it’s dark gray. (Keep in mind that frosting dries darker.) Tint the remaining frosting blue using about 4-5 big drops of blue gel food coloring. Tint until you are satisfied with the color. Remember, frosting dries darker, and we’re going for lighter Cookie Monster blue, not darker Grover blue!
  9. Level the cakes & add the crumb coat: Using a large serrated knife, slice the domes off the cooled cakes (a semi-thin layer) to create a flat surface. Place tops into a bowl to use in step 10. Place 1 cake layer on your cake stand, serving plate, or cake turntable. Spread 1 cup (about 250g) of white untinted frosting all over the top. (Reserve remaining white frosting for step 10.) Top with 2nd layer. Spread a thin layer of blue frosting around the sides and top of the cake. This is your crumb coat and should be a pretty thin layer. An icing spatula and bench scraper are helpful for this. Chill uncovered in the refrigerator or freezer for at least 30 minutes to help set the crumb coat.
  10. Meanwhile, shape Cookie Monster’s eyes: Crumble the pieces of cake that you leveled off into crumbs. I just use my hands for this. Stir in 1 Tablespoon of white frosting. If the mixture still seems pretty crumby and dry, add a little more of the white frosting until you have a moist mixture that you can form into shapes. Mixture shouldn’t be overly wet. Form into two 2-inch discs. Smooth them out as best you can. Place on a lined baking sheet and chill in the refrigerator or freezer for at least 30 minutes to set. Once they’re set, you can smooth out any bumps on the surface with your hands if needed.
  11. Meanwhile, pipe Cookie Monster’s fur: First, spread a thin layer of black frosting on the bottom half of the top of the cake. Use a small offset spatula to help ensure it’s perfectly smooth. Reserve remaining black frosting. Using a toothpick, trace/outline Cookie’s mouth shape within the black frosting. Use it as your guide for piping his fur around it. Fit your piping bag with Wilton piping tip #233 (grass tip). Spoon some blue frosting inside. It’s difficult to pipe this frosting if the bag is over-filled, so just work with a little bit of frosting in the bag at a time. Place the tip directly on top of the cake’s surface and apply pressure to squeeze the frosting out of the tip. Quickly lift the tip up while squeezing the frosting out. Pipe his fur all over the top and sides of the cake. (The sides are optional, but if you have enough frosting, go for it!) It’s helpful to carefully tilt the cake stand/turntable so you can more easily pipe frosting on the sides. Set cake aside. You can refrigerate uncovered if desired as you finish Cookie’s eyes.
  12. Coat the eyes: Melt the white chocolate and oil together in a double boiler or the microwave. If using the microwave: place the chopped chocolate and oil in a medium heat-proof bowl. Microwave for 20-second increments, stirring after each time, until completely melted and smooth. Place one of the discs (eyes) into the white chocolate. Use a fork to help fully coat it. Using a fork, lift the disc (eye) out of the chocolate. Place back onto lined baking sheet. Repeat with 2nd disc (eye). Refrigerate or freeze for 20 minutes or until white chocolate has set.
  13. Finishing touches: After the white chocolate sets, fit your piping bag with Wilton tip #12 (round tip). Spoon some black frosting inside. Pipe Cookie Monster’s pupils onto the eyes—remember to make them off-center and “googly”. Carefully press the eyes on top of the cake to form Cookie’s face. If desired, add chocolate chip cookies around the cake and in his mouth, see Note.
  14. Serve & store: If you decorated the cake on a cake turntable, use a couple thin spatulas (and a helper!) to carefully lift the cake off the turntable and onto a cake stand, server, or cake carrier base. I actually like to use a cake carrier to cover and store my cakes in the refrigerator.
  15. Cover leftover cake tightly and store in the refrigerator for up to 5 days.

Notes

  1. Make-Ahead Instructions: You can prepare the cake layers ahead of time. Wrap the individual baked and cooled cake layers tightly and refrigerate for up to 2 days. You can also assemble the cake with Cookie Monster’s mouth & piped fur 2 days ahead of time, too. You can also make, coat in white chocolate, cover, and refrigerate his eyes ahead of time as well. Do not place on cake until the day of serving as the blue from Cookie’s fur may smear onto the eyes. Pipe his pupils the day of serving because the black can smear down onto his eyes if refrigerated ahead of time. It did this for me, so I just carefully wiped it off.
  2. Freezing Instructions: Freeze the cake layers for up to 3 months. See How to Freeze Cake for instructions. Bring cake layers to room temperature, then continue with step 7.
  3. Recommended Tools: KitchenAid Stand Mixer | 9-inch Cake Pans | Grass TipRound Tip | Piping Bags (disposable or reusable) | Toothpick | Cake Turntable | Small Offset Spatula | Large Icing Spatula | Bench Scraper | Blue & Black Gel Food Coloring
  4. Whole Milk & Sour Cream: Whole milk and sour cream are strongly recommended for the best taste and texture. A full fat plain yogurt would work instead, though the cake may not be as light. Same goes with a lower fat milk.
  5. White Chocolate: Use real white chocolate to coat the eyes. You can use high-quality white chocolate chips if needed (I prefer Ghirardelli brand), but I recommend using pure chocolate baking bars. You can find them right next to the chocolate chips in the baking aisle. They are sold in 4-ounce (113g) bars. I like Bakers or Ghirardelli brands. You can also use 4 ounces of white candy melts.
  6. Food Coloring: Use gel, not liquid, food coloring. I recommend Americolor brand in royal blue and black. If you’d like to use natural food coloring, I like the brand Supernatural; they have some powdered food coloring that works well in frosting.
  7. Serving: This cake serves about 12 people, but I served nearly 20 people (10 adults and 10 kids). Cut thin slices.
  8. Cookies for Garnish: Use this recipe for mini M&M cookies, swapping mini chocolate chips for the mini M&Ms. For full-size cookies, use this recipe for chocolate chip cookies.

Keywords: cookie monster cake

Reader Questions and Reviews

  1. Hello! Wondering if you have a good recommendation on subbing for the egg whites? My son is allergic to eggs. Usually I sub 1/4 cup applesauce, but that is for a whole egg, but just egg whites. Thanks! Love your recipes!

    1. Hi Susanne! We do not have much experience baking with egg substitutions, so unfortunately we can’t offer any advice here. We’d recommend doing some research online to see what other bakers recommend or even to find a recipe that is specifically formulated to not use eggs. If you’re ever interested, here are all of our egg-free recipes. Let us know what you try!

  2. This is amazing! You are the only baker I follow and I’m throwing a Sesame Street themed party for my son’s first birthday. I’m a Grover and Cookie Monster fan, rather than Elmo so I was so excited to see this. Thank you!

  3. Hi, how should I store the frosting in order to pipe on his pupils if I do his fur the day prior?

    1. Hi Jillian, you can store the frosting covered in the refrigerator.

  4. Loved the recipe as well it’s a great exposure for decorating prospective.

  5. Can I use a 8 in pan instead of a 9in? If so, what would the baking time be?

    1. Hi Heather! You can use two 8 inch pans instead of 9 inch. The bake time will be slightly longer but we’re unsure of the exact bake time. Hope it’s a hit!

    2. The cake was a success, it was moist and delicious, easy to make!

  6. Hey can we use buttermilk as a substitute for sour cream in this recipe??

    1. Hi Rachana, The best way to use buttermilk is to have it replace both the sour cream AND milk in this recipe. Use 1 and 1/2 cups of buttermilk, then leave out the sour cream and whole milk. Enjoy!

  7. Hey, can we use salted butter for the frosting and leave out the salt instead??

    1. Hi Rachana, You can use salted butter. Taste the frosting before adding salt, then add salt to taste.

  8. Hi Sally… Can i make the frosting a day before putting it all together?

    1. Hi Ritukar, you can make the frosting the day before and store in the refrigerator until ready to use.

  9. Hi Sally,

    Do you know what shade of blue food coloring you used? The link takes me to orange!

    Thank you!

    1. Hi Danielle, The name of the color is “Royal Blue” and we just fixed the links so they should take you to the correct color. We hope you love the cake!

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