HEAT oven to 350°F.
PREPARE cake mix as directed on package, using egg whites. Spoon batter into paper-lined muffin pan, filling each cup 1/2 full. Bake as directed on package. Cool cupcakes in pan 15 minutes. Pierce cupcakes with large fork at 1/2-inch intervals.
MEANWHILE, stir boiling water into gelatin in medium bowl at least 2 minutes until completely dissolved. Spoon carefully over cupcakes. Refrigerate 3 hours.
FROST cupcakes with whipped topping. Draw footballs on cupcakes with decorating icing. Decorate with sprinkles. Store leftover cupcakes in refrigerator.
Special Extra: Decorate cupcakes with the colors of your favorite football team.