This is a family favorite on my husband's side, and he always asks for it for birthdays. It is super easy so I never complain!
1 angel food cake, baked (store-bought is just fine!)
1 3 oz. pkg Jell-o (we always use strawberry but other flavors would be great too)
1 8 oz tub Cool Whip, thawed
Slice cake in half horizontally. Fold Jell-o mix into cool whip until blended. Spread 1/3 of the Cool Whip mixture over bottom layer of cake, cover with top layer. Frost top and sides with remaining Cool Whip mixture. Better if refrigerated a couple hours but can also be eaten immediately. Garnish with fresh berries, if desired.