Birthday Cake Remix Brownies

Bahan-bahan (12 porsi)

• ½ cup (1 stick) unsalted butter
• 1 large egg
• 1 cup light brown sugar, lightly packed
• 1 tablespoon imitation vanilla extract
• 1 cup all-purpose flour
• Pinch of salt
• Pinch of baking powder
• ¼ cup white chocolate chips
• ¼ cup semi sweet chocolate chips
• ¼ cup rainbow sprinkles, plus more to top
• 5 tablespoons unsalted butter
• ½ cup granulated sugar
• ½ cup unsweetened dark cocoa powder (dutch process works best here)
• ¼ teaspoon vanilla extract
• 1 large egg, cold
• Pinch of salt
• Pinch of baking powder
• ¼ cup all purpose flour