One Giant Monster M&M Cookie

This giant monster cookie is enormous and satisfies the biggest chocolate peanut butter craving. Reduced down from my monster cookies recipe, this small-batch cookie recipe is plenty for 1-2 people.

Big M&M cookie

Have you ever made an enormous cookie before?

And don’t cheat by telling me you’ve made chocolate chip cookie pizza or chocolate chip cookie cake, both of which are meant for a crowd. No, no. I’m talking about a REALLY GIANT COOKIE meant for one person. Two if you’re willing to share the wealth.

This recipe, brought back to life from my blog archives, yields one absolutely enormous monster cookie. Don’t let these pictures fool you. This cookie is 6 inches in diameter and about 1 million calories of goodness. Those cracks you see? Call them the Cookie Grand Canyon. The chocolate chips? Actual chocolate mountains.

Its size is simultaneously ridiculous and awesome.

One giant monster cookie split in half

A few weeks ago, I made peanut butter bars and chocolate chip cookie brownie bars for a dear friend’s baby shower. I came home, realized I didn’t meet my chocolate and peanut butter consumption needs for the day– as one does– and decided to make a giant monster cookie when settling down for a night of Netflix. (Full honesty here: I did share it with my husband Kevin.)

But I forgot how good this recipe was!!!! Kevin asked me why we don’t make giant cookies more often. They’re just bigger, better versions of an already delicious food.

The next week I decided to remake, re-photograph, and repost it. A dessert this good– and this giant– should never get lost in the archives.

Welcome back, mega monster cookie! You’re looking better than ever.


Monster cookie dough

How to Make One Giant Monster Cookie

The ingredients are exactly the same as my regular batch of monster cookies, only significantly reduced. The process is the same too, but you only need 1 bowl! Cream butter and sugars together, then beat in the dry ingredients. It’s best to use a mixer, but if you don’t have one, make sure the butter is nicely softened so you can easily mix it.

Want to leave out the peanut butter? No problem. For a giant oatmeal M&M cookie, simply skip the peanut butter. For a chocolate version, try my XXL Death by Chocolate Cookie.

The only tricky part, if I can even call it that, is the egg. 1 egg is simply too much, so only use SOME of it. Crack 1 egg, beat it, then use 2 Tablespoons of the beaten egg. (Add the rest to your scrambled eggs the next morning!) Don’t use just the egg yolk or just the egg white in this cookie.

The cookie dough is a little sticky, but do your best to form it into a mound on the cookie sheet. A rubber spatula or spoon helps. You can always chill the dough in the refrigerator as you preheat the oven, too. Colder dough is easier to work with.

However, don’t chill too long or else the giant cookie won’t spread.

Peanut butter monster cookie dough on baking sheet

One giant monster cookie on baking sheet

No Cookie Dough Chilling

That’s actually a bonus in this recipe: no cookie dough chilling required! It’s quick and easy, a definite bonus when peanut butter chocolate cravings are on the line.

(Here are all of my no dough chilling cookie recipes.)

Depending on your oven and how tall the cookie dough mound is, this giant cookie takes anywhere from 20-30 minutes. Since it’s so large, it’s best to bake it at a slightly lower temperature. Keep an eye on it. The cookie is done when the edges and top are lightly browned. The center stays nice and soft, but eventually sets as the cookie cools.

One giant monster cookie

Your weekend will be totally delicious. But wait, there’s more:

More Giant Cookie Recipes

One giant monster cookie

One Giant Monster Cookie

  • Author: Sally
  • Prep Time: 10 minutes
  • Cook Time: 25 minutes
  • Total Time: 45 minutes
  • Yield: 1 cookie
  • Category: Dessert
  • Method: Baking
  • Cuisine: American


Use this cookie dough to make one giant monster cookie or 4 smaller monster cookies. Feel free to substitute the M&Ms or chocolate chips with your favorite add-ins such as chopped peanut butter cups, raisins, white chocolate chips, or chopped nuts.


  • 2 Tablespoons (29g) unsalted butter, softened to room temperature
  • 2 Tablespoons (25g) granulated sugar
  • 2 Tablespoons (25g) packed light or dark brown sugar
  • 2 Tablespoons (30ml) beaten egg (crack an egg, beat it, then use 2 Tbsp)
  • 1/2 teaspoon pure vanilla extract
  • 2 Tablespoons (31g) creamy peanut butter*
  • 6 Tablespoons (45g) all-purpose flour
  • 2 Tablespoons (10g) old-fashioned whole rolled oats (or quick oats)
  • 1/4 teaspoon baking soda
  • 1/8 teaspoon salt
  • 1/3 cup (65g) M&Ms
  • 2 Tablespoons (22g) semi-sweet chocolate chips, plus extra for garnish if desired


  1. Preheat oven to 325Β°F (163Β°C). Line a large baking sheet with parchment paper or a silicone baking mat.
  2. Using a handheld or stand mixer fitted with a paddle or whisk attachment, beat the butter, granulated sugar, and brown sugar together in a large bowl on medium-high speed until combined and creamy. Add beaten egg, vanilla extract, and peanut butter then beat on medium-high speed until combined. Scrape down the sides and up the bottom of the bowl as needed. Beat in the flour, oats, baking soda, and salt on low speed, then beat in the M&Ms and chocolate chips until combined. The dough will be sticky. If it’s too sticky to handle, chill in the refrigerator for 5-10 minutes.
  3. Shape into a mound in the center of the lined baking sheet. Bake for 20-30 minutes until edges and top are lightly browned. The center will look super soft, but it will set as the cookie cools. If the cookie isn’t spreading as it bakes, remove it from the oven, then gently flatten with a spoon.
  4. Cool the cookie on the baking sheet for 10 minutes before eating. As it cools, press a few chocolate chips into the top, if desired, for garnish. Cookie freezes well up to 3 months. Thaw at room temperature.


  1. One Batch: Want to make a whole batch of monster cookies? Here’s my recipe for Monster Cookies.
  2. 4 Smaller Monster Cookies: You can use this recipe to make four smaller monster cookies. Just divide the dough into 4 smaller mounds on the lined baking sheet. Bake for 10-12 minutes or until lightly browned around the edges.
  3. Peanut Butter: Use a thick non-natural style peanut butter such as Jif or Skippy. Crunchy peanut butter works, too! If using a natural peanut butter, make sure it’s on the thicker side. And feel free to skip the peanut butter, making no other changes to the recipe.

Keywords: cookie, monster cookies


  1. Your trip looked amazing! As does that giant cookie. I am in love with giant cookies. I’ve made your sugar, chocolate, and pb ones and loved them all. I’ve never had a monster cookie but what better way to start than with a giant one πŸ˜‰

  2. I love gigantic cookies! AND you know, with PB! Every one has got to have at least 1 (or a dozen) this summer! I make a version and leave it out for my milk man…I’m sure he loves it. I’m just not awake at 4:30 a.m. to see his reaction. Maybe I should put up a cam…
    Well, I’ll have to bake these with my little one tmrw. And, leave one out for the mail lady…she’ll love it! (I actually have your Red Velvet Cream Cheese Brownies baking right now!)
    Can you tell, I’m always in the kitchen? (=

    1. You love those red velvet brownies my friend. And I do too! I have to make them again soon. And yes – I bet your milkman loves those giant cookies. So sweet of you Gloria! πŸ™‚

  3. What do you even say about a cookie that size of your face???? Ummm PASS ME A FORK! Also, I would not share this cookie. If Kevin even got one bite, you are a better woman than I am. πŸ˜‰

  4. These giant cookie recipes have been the death of me!!! I have made every recipe multiple times for me and my two roommates! They are PERFECT for midnight cravings and for someone who doesn’t have an electric mixer. Oatmeal cookies are my all time favorite and this post has just made my day ten times better! I cannot wait to make this cookie!

  5. I LOVE your giant cookies Sally! I made one of them before and embarrassing enough – I usually don’t share! I like to nibble on it all day long until it’s gone. Love this giant m&m version!

  6. I LOVED monster cookies as a child, but have had a hard time finding a recipe that does not feed an army! I can’t wait to try these Giant monster cookies!! And I think I will serve it warm with a little ice cream on top as dessert for my family one night this week! I think I will be voted the favorite mommy and wife that night!
    Thanks for the awesome recipes!

  7. Well well well, look who’s at it again with her giant cookies! Seriously Sally, each one you make is better than the last! I can’t wait to try this one! Giant cookies totally make me feel like I’m dieting since I’m only having ONE πŸ™‚ It’s awesome portion control haha

  8. I adore your XXL cookies, Sally! Not sure if you have noticed, but I’ve already made (and posted about) two of your XXL cookies. They are so delicious and fun to make. Plus, it’s so much better sharing one XXL cookie than having multiple cookies hanging around. Keep the XXL recipes coming. πŸ™‚ (Btw, I think I might try making an Oatmeal Raisin/Raisinette XXL cookie soon. I’ll keep you posted!!)

    1. I love these giant cookies! So wonderful to share and great for portion control… unless of course you eat the whole thing. πŸ˜‰ Thanks Elaine!

  9. With so many tempting mix-ins, how could you even think about sharing?? I’m impressed — and lucky Kevin! Thankfully my guy doesn’t like chocolate OR peanut butter, so I’d get your monster cookie all to myself. Definitely not complaining!

  10. I am so down with this giant cookie madness. I’m definitely putting this on my must make list. I kept seeing your photos on Instagram and thinking you were on my island, then I remembered you weren’t even in my ocean. I hope your trip was lovely.

  11. Four cookies in one? I LOVE homemade chocolate chip cookies and my absolute limit for myself is four cookies per day. If I ate only one of these, I might feel like I was ahead of my diet…unless of course I justify eating more by saying I could eat 4 of these! (Hmmm, is that 16 cookies?!?) Is there a chocolate chip cookie version of this?

  12. I made all of your giant cookies this week. πŸ™‚ I love this and the peanut butter best! The Snickerdoodle and Sugar spread alot but still turned out great. Thanks for the awesome recipies!

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With kitchen-tested quality recipes and step-by-step tutorials, my goal is to give you the confidence to bake and cook from scratch.

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About Sally

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I’m Sally, a cookbook author, photographer, and blogger. My goal is to give you the confidence and knowledge to cook and bake from scratch while providing quality recipes and plenty of pictures. Grab a cookie, take a seat, and have fun exploring! more about Sally