brownie cookie cake slice topped with rainbow sprinkles on a plate

Brownie Cookie Cake

Servings
12

You’ve heard of a cookie cake but what about a brownie cake? This fudgy brownie cookie cake has all of the ease of a one layer cookie cake and all of the deliciousness of a brownie. It started with browned butter poured over semisweet chocolate. Once you quickly mix up the batter the recipe is…

Brownie Cookie Cake

You’ve heard of a cookie cake but what about a brownie cake? This fudgy brownie cookie cake has all of the ease of a one layer cookie cake and all of the deliciousness of a brownie. It started with browned butter poured over semisweet chocolate. Once you quickly mix up the batter the recipe is baked in a springform pan which is the key to getting those nice edges!

slice of brownie cookie cake topped with chocolate buttercream frosting and rainbow sprinkles with a fork

One of my favorite parts about the Brownie Cookie Cake is the milk chocolate buttercream on top. It is made with cocoa powder and just a little but of melted and cooled chocolate for the perfectly sweet and decadent topping. Feel free to decorate however you please, or even switch it up with a vanilla frosting that you can dye different colors!

side view of a brownie cookie cake topped with chocolate buttercream frosting and rainbow sprinkles
The Shiny Crackle Top

One of THE most important parts about a good brownie is that shiny crinkle top. To achieve this, temperature is very important. Make sure that your butter is HOT when you pour it over those semisweet chips and quickly add that melted mixture to your eggs, sugars, cocoa powder and vanilla. This will help melt some of those sugars and give you that beautiful look!

top view of a brownie in a cake pan, which is the base for brownie cookie cake

Brownie Cookie Cake

This single layer brownie cookie cake was inspired by the one of the best celebration cakes out there- the cookie cake. A layer of fudgey brown butter brownies topped with a decadent milk chocolate frosting
PRep Time20 minutes
Cook Time40 minutes
Servings 12 slices
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Equipment

  • 1 Whisk or handmixer
  • 1 9 inch Springform Pan
  • Parchment Paper

Ingredients

Brownie Layer

  • 1 cup 227g butter
  • 1 cup 6oz semi-sweet chocolate chips
  • 1 cup 200g granulated sugar
  • 1/2 cup 100 dark brown sugar
  • 3/4 cup 60g Dutch-process cocoa powder spooned and leveled
  • 3 large eggs
  • 2 tsp vanilla extract
  • 1/2 cup 60g all-purpose flour
  • 1 tsp kosher salt

Milk Chocolate Frosting

  • 1 cup 16 Tbsp; 226g unsalted butter, softened to room temperature
  • 3 1/2 cups 420g confectioners sugar
  • 1/2 cup 41g dutch-process cocoa powder
  • 2 oz milk chocolate chips (or bar) melted and cooled slightly
  • 1/4 teaspoon salt

Instructions

  • Preheat oven to 350F
  • Line a springform 9 inch pan with a single sheet of parchment and grease the sides of the pan, set aside
  • In a medium HEATPROOF bowl, add the chocolate chips and set aside
  • Brown the butter over medium heat. In a large saucepan, place the 1 cup (227g) of butter and turn heat to medium, butter will begin to melt then foam, stir intermittently until butter appears brown in color and smells toasty. Remove from heat and pour directly over the chocolate chips in their heat proof bowl. This is important! Do not let the butter cool. Next, let the butter/chocolate mixture sit so that the heat from the butter melts the chocolate for about 2 minutes. Mix with a nonstick spatula until chips and butter are completely smooth
  • In a separate large bowl, add the sugars, cocoa powder, eggs, and vanilla. Using a hand mixer mix until light in color, fluffy and smooth.
  • Add in melted chocolate and brown butter to the whipped sugars, cocoa powder, eggs, and vanilla in the larger bowl. Mix with a nonstick spatula until smooth. Add in flour and salt and mix again until thick batter forms
  • Pour batter into springform pan and bake for 35-45 minutes checking for a firm edge and a set center
  • Remove from oven and let cool!

Make the Frosting

  • In the bowl of a standmixer fitted with a paddle attatchment (or a large bowl + a handmixer) add butter and confectioner’s sugar
  • Mix until light and fluffy, on medium speed about 5 minutes, add cocoa powder and mix until completely combined.
  • Add in the cooled melted chocolate and salt mix again until smooth. Make sure to keep the speed low at first to combine then to move it up to medium to help the frosting stay fluffy!
  • Using a piping bag with a closed star piping tip (or plastic bag)pipe stars around the border of the COOLED cake. Top with sprinkles and slice!

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  1. This is such an amazing idea, but I highly recommend you edit this to include the critical note about putting the hot butter/chocolate mixture immediately into the other items while it is still hot. That is not clear in the body of the recipe.

    I had my family make this for my birthday and they followed the recipe to the letter and it turned out terrible and so greasy. I only realized later why it didn’t turn out – they missed the critical instruction that wasn’t included in the body of the recipe itself.

  2. May I request that you elaborate on that? Your posts have been extremely helpful to me. Thank you!