Preheat oven to 350ºF and lightly grease a 8×12 brownie pan with cooking spray. Melt butter in 20 second increments in a large microwave safe bowl. Whisk sugar, brown sugar and vanilla into hot butter until smooth. Whisk in eggs one at a time. Stir in flour, cocoa powder, baking powder and salt until combined. Do not over mix. Fold in chocolate chips..
Spread batter in prepared pan. Place brownie divider in pan and get your kids to help by adding their favorite toppings! Bake for 28-30 minutes or until edges of brownies are set. Center can still be soft for fudgy brownies.
Cool brownies at room temperature for 30 minutes before removing divider
To ensure food safety, eggs should be cooked until both the yolk and the white are firm. Consuming raw or undercooked eggs may increase your risk of foodborne illness, especially for those with certain medical conditions. For recipes that call for eggs that are raw or undercooked when the dish is served, use either pasteurized shell eggs that have been treated to destroy Salmonella, or use pasteurized egg products.