Chocolate Chip Cookie Cake from Life, Love, and Sugar
3/4 cup unsalted butter, room temperature
3/4 cup dark brown sugar
1/4 cup sugar
2 tsp vanilla extract
2 cups all purpose flour
2 tsp cornstarch (I think this may be the key)
1 tsp baking soda
1/2 tsp salt
1 1/4 cups semi-sweet chocolate chips OR about 1 cup of chocolate chunks
1/2 cup butter
1/2 cup shortening
4 cups powdered sugar
1 tsp vanilla extract
2-3 tbsp water
Cream butter and sugar together until light and fluffy, about 3-4 minutes. Mix in egg and vanilla extract. With the mixer on low speed, add flour, cornstarch, baking soda and salt. Stir in chocolate chips. Dough will be thick. Chill for at least 30 minutes or overnight. When ready to bake, preheat oven to 350 degrees. Place parchment paper into the bottom of your cake pan (I actually used a springform pan) to help the cookie not stick. Spread the dough out into the cake pan. Bake for 18-20 minutes or until the edges are slightly golden.
Remove from oven and let cool for a couple minutes on the cookie sheet, then transfer to cooling rack to cool completely.
For Vanilla Buttercream
Beat the shortening and butter until smooth. Slowly add 3 cups of powdered sugar. Mix until combined. Mix in the vanilla extract and 1 tbsp water. Add the rest of the powdered sugar and mix until smooth. Add more water to get the right consistency.