Bake per box instructions. (I used white cake mix and stirred in four tablespoons of red/white/blue decorating sprinkles as cup cake decorations.) Make butter cream icing and tint 1/3 royal blue/, 1/3 white, and 1/3 red.
Using decorator # 33, pull out blue “fireworks” around outside edge. Then do a circle of white. Finish with red center. Stick mini flags in the center.
This is from Wilton, very easy to do.