Ingredients
Chocolate chip cookie cake:
- 3 cups all purpose flour
- 2 teaspoons baking powder
- 1 teaspoon salt
- 2 sticks unsalted butter, softened
- 1 1/2 cups brown sugar
- 2 eggs
- 2 teaspoons vanilla extract
- 1 cup semisweet chocolate chips
- 1 cup peanut butter chips
Peanut butter marshmallow filling:
- 1/2 cup sugar
- 1/4 cup egg whites (from about 2 large eggs)
- 1 1/2 teaspoons vanilla extract
- 1/4 cup creamy peanut butter
- 6 tablespoons (3/4 stick) chilled unsalted butter, cut into 1/4-inch cubes
- Pinch of salt
Cookie dough frosting:
- 1 1/2 sticks unsalted butter, softened
- 1/3 cup brown sugar
- 1/3 cup all purpose flour
- 1/2 teaspoon salt
- 2 teaspoons vanilla extract
- 4 cups powdered sugar
- 1/3 cup heavy whipping cream
Instructions
Make the cake:
- Preheat the oven to 350F. Line two 9-inch round pans with parchment paper or grease with cooking spray. Set aside.
- In a large bowl, whisk together the flour, baking powder, and salt. Set aside.
- In a large mixing bowl, beat together the butter and sugar until creamy and fluffy, 2-3 minutes. Beat in the eggs, one at a time, until well blended. Beat in the vanilla. Gradually beat in the flour mixture then add the chocolate chips.
- Divide the dough between the two cake pans. Bake 20 minutes or until golden and a toothpick comes out clean. Cool completely in the pans.
Make the filling:
- Combine sugar and egg whites in a medium metal bowl set over a saucepan of simmering water. Whisk constantly until sugar dissolves and mixture is hot to the touch, 3–4 minutes.
- Remove from heat; using an electric mixer, beat on high speed until cool and thick, 5–6 minutes.
- Beat in vanilla, then peanut butter.
- With mixer running, add butter a few pieces at a time, beating to blend between additions.
- Season with salt to taste.
Make the frosting:
- In a large bowl, beat together the butter and sugar until creamy and fluffy, about 2-3 minutes.
- Beat in the flour, salt, and vanilla.
- Gradually beat in the powdered sugar.
- Beat in the heavy cream and beat another 1-2 minutes or until the frosting is fluffy.