Peanut Butter Cookie Dough Brownie Layer Cake Recipe

Brownies:

1 1/2 cup vegetable oil
3 cups sugar
3 tsp vanilla extract
6 eggs
1 1/2 cup flour
1 cup cocoa (I use Hershey’s Special Dark)
3/4 tsp baking powder

Cookie Dough:

1 1/4 cup butter, room temperature
1 1/4 cup dark brown sugar
1/2 cup sugar
3/4 cup peanut butter
3 tsp vanilla extract
2 1/2 cups all purpose flour
3-4 tbsp milk
1 cup semi-sweet chocolate chips

Chocolate Ganache:

12 oz semi-sweet chocolate chips, divided
1 cup heavy whipping cream, divided

Peanut Butter Frosting:

1/4 cup butter
1/4 cup shortening
1/2 cup peanut butter
2 cups powdered sugar
1 tbsp water or milk
mini chocolate chips, for topping, if desired