Chocolate Chip Cookie Chocolate Layer Cake with S'mores Frosting

I am so excited about this cake!  I told my little brother about it and he said it sounded like a heart attack on a plate.  I asked what was the point otherwise?  If you're going to do it, make it worth it!  This cake is totally worth it.  I found the idea and chocolate chip cookie recipe here, and modified this frosting recipe.  The result?  Amazing.  The cookie layers are soft and chewy, and the chocolate cake is dense and fudgy.  The frosting is the perfect finish!


Chocolate Chip Cookie Chocolate Layer Cake with S'mores Frosting

Cookie Layers:
3/4 cup (1 1/2 sticks) butter, room temperature
3/4 cup packed brown sugar
1/2 cup granulated sugar
1 egg
1 teaspoon vanilla extract
2 cups all purpose flour
3/4 teaspoon baking soda
3/4 teaspoon baking powder
1/2 teaspoon salt
1/2 cup semi sweet chocolate chips
1/2 cup milk chocolate chips

Chocolate Cake Layers:

1 1/2 ounces semi-sweet chocolate chips   

2/3 cup milk    

2/3 cups hot water   

2/3 cup mayonnaise 

2 large eggs  

1 teaspoons vanilla extract 

1 1/2 cups granulated sugar

1 1/2 cups all-purpose flour  

2/3 cup unsweetened cocoa powder 

1 1/2 teaspoons baking soda 

3/4 teaspoons baking powder  

3/4 teaspoon salt 

S'mores Frosting:
1 cup semi sweet chocolate chips, melted and cooled slightly
1/2 cup milk chocolate chips, melted and cooled slightly
12 regular size marshmallows (not mini), melted
3/4 cup (1 1/2 sticks) butter, room temperature
1 teaspoon vanilla extract
6 cups powdered sugar
4 to 6 Tablespoons milk

For the cookie layers, preheat the oven to 350F.  Line 2 9-inch round cake pans with parchment paper, and grease the pans and parchment.

Cream together the butter, brown sugar, and granulated sugar until light and fluffy.  Beat in the egg and vanilla until combined.  Add the flour, baking soda, baking powder, and salt and beat until just combined.  Stir in the semi sweet and milk chocolate chips.  Divide the dough in half and press each half evenly into one of the prepared pans.

Bake the cookies for 12 to 14 minutes (you want these cookies to be slightly underdone so they will be soft enough to cut).  Remove cookies from the oven and let cool completely in the pan.  When cool, loosen the edges of the cookies and turn out of the pans.  Set aside while you make the cake layers.

For the cake, preheat the oven to 350F.  Grease 2 9-inch round cake pans and line the bottoms with parchment paper.  Grease the parchment paper, set aside.

In a medium microwaveable bowl, combine the chocolate chips, and milk.  Heat in the microwave for about 1 minute, or until the milk is steaming, but not boiling.  Remove from the microwave and let sit for a minute or two.  Stir gently until combined, then add the hot water and set aside.

In a large bowl, or with a stand mixer, beat together the mayonnaise, eggs, vanilla, and sugar until well blended and smooth.  Add the flour, cocoa powder, baking soda, baking powder, salt, and the milk/chocolate mixture.  Beat together until combined and smooth. Divide the batter equally between the two pans. 

Bake the cakes for 20 to 25 minutes, or until a toothpick inserted in the center comes out clean. Remove the cakes from the oven and place on cooling racks for about 10 to 15 minutes.  Turn out the cakes onto the cooling racks and peel the parchment paper off the bottoms of the cakes.  Let the cakes cool completely before frosting.

For the frosting, beat together the melted chocolate, melted marshmallows, butter, and vanilla until smooth.  Beat in 3 cups of the powdered sugar until smooth.  Add 4 tablespoons of milk and beat until blended.  Add the remaining 3 cups of powdered sugar and beat until light and fluffy. Beat in the remaining milk if necessary.

To assemble the cake, place one cookie layer on a serving plate.  Spread with a thin layer of frosting.  Place one cake layer upside down on top and spread the top with frosting.  Place the second cookie layer on top of the cake and spread with a thin layer of frosting.  Place the second cake layer upside down on top and frost the top and sides of the cake with remaining frosting.  Makes 16 serving.

Enjoy!  -Cardamommy