Preheat the oven to 350 F, and line a 9x13 baking pan with foil and spray with non-stick cooking spray.
Prepare and bake the brownie batter according to package directions.
Remove the brownies from the oven and let cool completely.
Line a large baking sheet with parchment or wax paper.
Use the cookie cutter to cut out as many stars shapes, as possible, as close together as possible.
Place the cut brownies on the prepared baking sheet.
Place the frosting into a piping bag and line the edges of the stars with the white frosting.
Place the red, white and blue sprinkles into a shallow dish. "Dip" the frosting lined brownie into the sprinkles and gently press the sprinkles into the frosting. Repeat until all brownies are patriotic and festive. Enjoy!