Follow these simple steps to make delicious American Flag Brownies:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and line a 9×13 inch baking pan with parchment paper.
2. Melt Butter: In a medium saucepan, melt the unsalted butter over low heat. Remove from heat and stir in granulated sugar until combined.
3. Add Eggs and Vanilla: Beat in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract until fully incorporated.
4. Mix Dry Ingredients: In a separate bowl, whisk together flour, cocoa powder, baking powder, and salt.
5. Combine Mixtures: Gradually add the dry ingredients to the butter mixture, stirring until just combined.
6. Pour Batter: Pour the brownie batter into the prepared baking pan, spreading it evenly across the bottom.
7. Bake: Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
8. Cool Brownies: Remove the brownies from the oven and allow them to cool in the pan on a wire rack for about 15-20 minutes. Then, lift them out using the parchment paper and let them cool completely on the wire rack.
9. Decorate: Once cooled, use the red and blue frosting to create the American flag design. Use the red frosting to create stripes and the blue frosting for the stars. Add star sprinkles for an extra touch.
10. Slice and Serve: Cut into squares and serve at your next event!