According to the box, mix the cake batter(mix, egg whites, vegetable oil). Set aside.
According to the packet, mix the chocolate chip cookie batter(mix, egg, butter).
Scoop a spoonful of the cookie dough then form a ball. Set them in a nonstick pan or baking mat. Preheat the oven to 350degrees.Fill each of the cupcake liners with half of the cake batter, place 1 cookie dough ball on each, then pour remaining cake batter on each top. Bake them in the oven for 20 minutes. Cool the cupcakes completely.
Make the frosting. Beat butter, cream cheese, powdered sugar, and a pinch of salt.
Frost the cupcakes. Garnish with chocolate chips if you want.