So here's what you do. Bake a chocolate short cake (or a chocolate sponge cake) in a 9 x 13 rectangular pan. Here's a link to a great Chocolate Shortcake. When the cake is cool, cover with a thick layer of whipped cream. For the stars, use blueberries, making a small square in the upper left hand corner of the cake. Place the blueberries in rows for best results. Leave some room between blueberries (the stars). For the stripes, cut the strawberries in half and put them flat side down to make stripes. Press gently into the whipped cream. Although there are 13 stripes on the flag, you don't need to have that many on your cake (and you won't have room). It's about aesthetics more than veracity. The bottom stripe of the flag is red, so that's a good place to start.
Don't want to make a chocolate short cake or sponge cake? Make your favorite chocolate cake and follow the decorating instructions. Or, you make a white chocolate sponge cake! Fabulous.
Happy Flag Day! Happy Strawberry Shortcake Day!