Red Velvet Brookie

Red Velvet Brownie Batter

• 6 oz all-purpose flour
• 1 tbsp cornstarch
• 2 oz unsweetened cocoa powder
• 1 ½ tsp salt
• 6 oz unsalted butter, room temperature
• 8 oz granulated sugar
• 2 oz light brown sugar
• 3 large eggs
• 1 egg yolk
• 1 tsp vanilla
• 1 tbsp red food coloring
• 2 ½ oz vegetable oil
• 1 tbsp white vinegar

Cookie Dough

• 4 oz unsalted butter, room temperature
• 3 oz granulated sugar
• 3 oz brown sugar
• 1 large egg
• 1 tsp vanilla extract
• 7 oz all-purpose flour
• ½ tsp baking soda
• ½ tsp baking powder
• 1 pinch salt
• 7 oz milk chocolate chips
• heart-shaped sugar sprinkles, to decorate (可选的)
  或 rainbow sprinkles, to decorate