Frosted Sugar Cookie Bars.

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Soft and chewy sugar cookie bars loaded with extra sprinkles and topped with thick vanilla frosting. And more sprinkles… of course.

Frosted sugar cookie bars with delicious vanilla frosting and lots of birthday cake sprinkles! Recipe on sallysbakingaddiction.com

These gorgeous pastel sugar cookie bars are about 5 years in the making. I’ve been dying to make sugar cookie bars with light ‘n sweet frosting for ages now. And I finally got around to it this past weekend. Let’s just call it my TV celebration treat. 🙂

In all their soft-baked, mile high frosting, sprinkles-to-the-max goodness… I can honestly say that these charming little treats were well worth the wait. I mean, just look at ’em.

The frosting is as thick as the cookie!! Have mercy.

Frosted sugar cookie bars with delicious vanilla frosting and lots of birthday cake sprinkles! Recipe on sallysbakingaddiction.com

Today’s recipe is as soft as my favorite soft-baked cookie, as chewy as my favorite blondie, and as sprinkly as my entire cookbook. You’ll find sprinkles in the cookie bar base AND on top of the frosting. Is there such a thing as too many sprinkles? Because I’m pretty sure we test those limits here on my blog.

To make the frosted sugar cookie bars ultra soft, I add a touch of cornstarch. Trust me on this! Think about it: often used as a thickening agent, cornstarch gives your gravy, pie fillings, soups, and glazes a more bodied and full texture. The same goes for your cookie dough – cornstarch will help your dough remain soft, thick, and puffy during the baking process. The small 1.5 teaspoons used is certainly a heavy lifter in this recipe!

To make the cookie bars ultra chewy, I add an extra egg yolk. I do this with a few of my cookie recipes because that little extra yolk adds so much moisture, tenderness, and chew to the cookie. And it does the same thing to the sugar cookie bar base in this recipe. You’re going to love their rich, tender texture.

Frosted sugar cookie bars with delicious vanilla frosting and lots of birthday cake sprinkles! Recipe on sallysbakingaddiction.com

What’s great about this recipe is that you don’t have to chill the cookie dough. Just press the dough into the pan and bake right away. Bake the bars in a square baking pan – 8 inch or 9 inch is fine. Only about 25 minutes. You want to slightly underbake the cookie bars in order to avoid the edges from getting too crispy and brown.

Allow the bars to cool completely before frosting. This will feel like an eternity.

Frosted Sugar Cookie Bars - soft baked and heavy on the sprinkles! Recipe by sallysbakingaddiction.com

If you’re the kind of person who eats cake just for the frosting, you’re going to love this recipe. And we would also get along very well. I may or may not have eaten the frosting off this cake before actually getting to the cake underneath. Uh, can you blame me?

You’ll use my basic vanilla frosting recipe for these bars. Classic, fluffy, and simple. I like to add a touch of salt to cut the frosting’s sweetness. With the sweet sugar cookie bar underneath, that tiny pinch of salt will help tame a sugar rush. Don’t get me wrong, these bars are still plenty sweet! Don’t bring them to your dentist.

And as you can see, the frosting layer is just as thick as the cookie layer. In some spots, even thicker – those were the best bites. The frosting recipe as written makes a ton, so don’t be afraid to frost the bars with a heavy hand.

Don’t want that much frosting? It’s ok, I forgive you. Feel free to halve the frosting recipe.

Frosted sugar cookie bars with delicious vanilla frosting and lots of birthday cake sprinkles! Recipe on sallysbakingaddiction.com

Ordinary ingredients can produce extraordinary desserts. Only simple, straightforward items used in this recipe and yet, the results will blow your mind!

Follow me on Instagram and tag #sallysbakingaddiction so I can see all the SBA recipes you make. 

Frosted Sugar Cookie Bars

Ingredients:

  • 1/2 cup (115g) unsalted butter, softened to room temperature
  • 3/4 cup (150g) granulated sugar
  • 1 large egg + 1 egg yolk1
  • 2 teaspoons vanilla extract
  • 1 and 1/2 cups (190g) spoon & leveled all-purpose flour
  • 1/4 teaspoon salt
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1 and 1/2 teaspoons cornstarch
  • 1/2 cup (80g) rainbow sprinkles (not nonpareils)2

Vanilla Frosting

  • 3/4 cup (170g) unsalted butter, softened to room temperature
  • 2 and 1/4 cups (270g) confectioners' sugar
  • 3 Tablespoons (45ml) heavy cream or half-and-half3
  • 1 teaspoon vanilla extract
  • salt, to taste

Optional

  • food coloring for frosting (I used 1 drop red for this pink frosting)
  • extra sprinkles for decorating on top

Directions:

  1. Make the bars: Preheat oven to 350°F (177°C). Line an 8-inch or 9-inch square baking pan with aluminum foil, making sure to leave enough overhang on the sides. Set aside.
  2. In a large bowl using a hand-held mixer or stand mixer fitted with a paddle attachment, cream the softened butter for about 1 minute on medium speed. Get it nice and smooth, then add the sugar on medium speed until fluffy and light in color. Beat in egg, egg yolk, and vanilla. Scrape down the sides as needed.
  3. In a medium bowl, whisk together the flour, salt, baking powder, baking soda, and cornstarch. With the mixer running on low speed, slowly add the dry ingredients to the wet ingredients in 3 different parts. The dough is quite thick. Once combined, gently fold in 1/2 cup sprinkles using a rubber spatula (or by mixing on low speed).
  4. Press the cookie dough evenly into the prepared baking pan. Bake for 25-26 minutes or until very lightly browned on top. You want the cookie bars to be extra soft, so careful not to overbake. Allow the bars to cool completely on a wire rack at room temperature before frosting. The center will slightly sink - that's normal.
  5. Make the frosting: If you don't want a super thick layer of frosting as pictured, halve the frosting recipe. With a handheld or stand mixer fitted with a paddle attachment, beat the butter on medium speed until creamy - about 2 minutes. Add confectioners' sugar, cream, and vanilla extract with the mixer running on low. Increase to high speed and beat for 3 full minutes. Add more confectioners' sugar if frosting is too thin or more cream if frosting is too thick. Add a pinch of salt if frosting is too sweet. I usually add anywhere between 1/8 - 1/4 teaspoon of salt. Beat in food coloring, if using.
  6. Remove cooled bars from the baking pan using the aluminum foil overhang on the sides. Frost the bars with a thick layer of frosting and decorate with extra sprinkles if desired. Cut into squares. Use a very sharp knife and wipe off with a paper towel between each cut to make neat, even cuts. Store bars in an airtight container at room temperature for up to 2 days and in the refrigerator up to 5.

Make ahead tip: You can make these bars and the frosting 1 day in advance-- store the bars, covered, at room temperature overnight and store the frosting, covered, in the refrigerator. Frost before cutting and serving. You can also freeze the unfrosted bars for up to 3 months. Thaw overnight in the refrigerator, frost, cut, and serve.

Recipe Notes:

  1. Room temperature egg and egg yolk preferred. To bring the egg to room temperature quickly, place in a warm glass of water for about 10 minutes as you get the other ingredients ready. Or just set out when you set out the butter to soften 1 hour ahead of time.
  2. Use regular sprinkles (aka "jimmies") in the cookie bar base. Nonpareils (the little balls) will bleed their color and turn the sugar cookie dough green/purple/brown. I order my sprinkles in bulk here.
  3. Cream or half-and-half is preferred for creamiest, fluffiest frosting. Keeping that in mind, milk would be an OK substitute if you do not have either on hand.

Larger batch: You can double this recipe and bake in a 9x13 pan; the bake time is about 35 minutes.

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246 Comments

All Comments

  1. These were delicious! Thick and chewy and perfect with strawberry frosting. ^_^ Thank you for the recipe!

  2. Hi Sally!
    I just wanted to say thank you so much for this recipe. I made them yesterday for my dad’s birthday. He has cancer and got a bone marrow transplant yesterday. He’s been having a hard time eating, but he loved these bars! He had two of them!! He loved them and said they tasted like they had a secret ingredient. Thank you for helping me bring so much happiness to my dad. Sending you, your husband, and coming little one lots of love.

  3. Hi Sally! I am in charge of making the desserts for a company party and I want to include your awesome Sugar Cookie bars! I want to make the desserts in sheet pan sizes. Would I double this recipe to work in a 15 x 10 x 1″ sheet pan? Thanks for your help!

    1. Hi! I actually doubled this recipe just this weekend and I used a half-sheet cookie sheet pan. which is 18X13X1. It worked really well! I was surprised on how fast it cooked. Just 15 minutes and the bars were plenty thick.

      1. Hi Erin! 
        Thank you for the mention of pan size & time.  I pressed my doubled recipe dough into a jellyroll as well.  It only took 16 minutes to bake and the texture was JUST what I was looking for – soft and just a bit chewy.  The only recipe change I made is to use butter flavoring instead of vanilla – one of my mom’s sugar cookie secrets!  The other is to use margarine instead of butter – makes for a softer cookie.   These were delicious and a hit at the Christmas homegroup potluck.  Thank you all for your comments! 

  4. Recently I had to make cookies without the baking soda because all I had was baking powder. I just substituted the baking powder 1:1 for the baking soda. They turned out great, but I was wondering if you can tell me how much difference that makes in a recipe? Do you know how much that alters the texture when you use only baking powder compared to baking soda?

  5. Not sure what I did wrong here. Mine turned out almost fluffy and cake-like. They still tasted good, but not the texture I hoped for. Any thoughts?

  6. Just made these last night for the first grade teacher and the whole class. They were chewy, sweet and absolutely delightful! Doubled the recipe in a 9×13 pan. Baked for 30 minutes. Halved the frosting and it was plenty sweet and scrumptious. Will definitely make it again. Thanks! 

  7. Sally, these have become an ‘asked for’ favorite at our house!!! Sometimes I replace almond flavoring for the vanilla flavoring in the frosting recipe. YUMMY!! Thanks for a very quick answer to sugar cookies, plus they travel so well. Cookies can break, these bars can take traveling miles and still look great.

  8. These look absolutely amazing and delicious!! I wish I could eat one through the screen!! Will make soon but scared I may not have any self control!!!

    1. I tend to make these when I know for sure I have company coming or an event to bring them to! Self control goes out the window with these around!!

  9. I have made these several times and I love the taste and texture but every time I have made there the edges are high and the middle sinks in. Is there a trick to avoid this from happening ? Thanks

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Reviews

Questions

  1. I noticed these bars can be stored in an airtight container for up to 2 days – is this because of the frosting? If unfrosted (we inhale these plain at our house) would they last longer at room temperature/wrapped tightly in the mail?

  2. I made these and they were much more cake-like than a chewy cookie bar. I know I followed the recipe – did I beat something too long/not long enough?

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