Creating your Star-Spangled Brownies is simple when you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line a 9×13 inch baking pan with parchment paper for easy removal.

2. Melt the Butter: In a medium saucepan, melt the unsalted butter over low heat. Remove from heat and let it cool slightly.

3. Mix in Sugar and Eggs: Stir the granulated sugar into the melted butter until well combined. Then, add the eggs one at a time, mixing well after each addition. Finally, stir in the vanilla extract.

4. Combine Dry Ingredients: In a separate bowl, whisk together the all-purpose flour, cocoa powder, baking powder, and salt.

5. Combine Mixtures: Gradually add the dry mixture to the wet ingredients, stirring until just combined. Be careful not to overmix.

6. Pour into Pan: Pour the brownie batter into the prepared baking pan, spreading it evenly.

7. Bake: Bake in the preheated oven for 25-30 minutes or until a toothpick inserted in the center comes out with a few moist crumbs. Do not overbake.

8. Cool the Brownies: Remove the brownies from the oven and let them cool in the pan for about 30 minutes. Once cool, lift them out using the parchment paper and transfer them to a cutting board.

9. Frost the Brownies: Once the brownies have completely cooled, spread the white frosting evenly over the top.

10. Decorate with Berries: Arrange the fresh strawberries and blueberries on top of the frosting to create a star-spangled design.

11. Cut and Serve: Cut the brownies into squares or rectangles, serving them with a smile!

These steps will guide you in creating deliciously festive Star-Spangled Brownies that will surely impress everyone at your gathering.