After removing the brownies from the oven, let them cool in the pan for 10 minutes. Then transfer them from the pan to a cooling rack and cool for up to 1 hour before frosting.
Place the cooled brownies on a cutting board. Use a football-shaped cookie cutter to cut out brownie footballs.
Spread a thin, even layer of chocolate frosting over each brownie, covering the top completely. Use an offset spatula or butter knife to smooth the surface.
Spoon vanilla frosting into a piping bag or a small zip-top bag with the corner snipped off.
Pipe one long horizontal line across the center of each brownie, then add three short vertical lines across it to resemble football laces.
Continue until all brownies are frosted. Enjoy!