A delightful twist on a classic dish.
1 cup unsalted butter, softened
1 cup granulated sugar
1/2 cup packed dark brown sugar
2 large eggs
2 teaspoons vanilla extract
1 1/4 cups all-purpose flour
1/2 cup unsweetened cocoa powder
1/2 teaspoon baking powder
1/4 teaspoon salt
1 cup semi-sweet chocolate chips
1/2 cup white chocolate chips (optional, for drizzling)