If you don't have Betty Crocker Decorating Decor stars or icing (or you think it would be too sweet), use Red, White, & Blue Holiday M&Ms. Just press them gently into the batter before baking.
Red White & Blue Star Brownies
1 box (1 lb 2.4 oz) Betty Crocker™ Original Supreme Premium brownie mix
Water, vegetable oil, and egg called for on brownie mix box
1/2 cup Betty Crocker™ Whipped fluffy white frosting (from 12-oz container)
Betty Crocker™ Decorating Decors stars
Heat oven to 350°F. Line 9-inch square pan with foil so foil extends about 2 inches over sides of pan. Spray foil with cooking spray.
Make and bake brownies as directed on box. Cool completely, about 1-1/2 hours.
Remove brownies from pan by lifting foil; peel foil from sides of brownies.
Using 2 1/2-inch star-shaped cookie cutter, cut brownies.
Squeeze frosting on star-shaped brownies.
Sprinkle with decors stars.