Skinny Funfetti Cupcakes Cupcakes: 1 pkg. Pillsbury Funfetti Cake Mix (just the powder, not the recipe) 1 -12 oz can Sprite Zero Frosting: 1 -8 oz container Fat Free Cool Whip 1 -1.5 oz. pkg. Vanilla Jello Instant Pudding (just the powder, not the recipe): Cupcakes: Preheat oven to 350. Combine cake mix and Sprite. Bake at 350 degrees for 20 minutes. Cool before frosting. Frosting: Mixing Cool Whip and pudding. Mix until smooth. Spread over cooled cupcakes.