Take 1 box white cake mix
Mix as directed but add 3 tbsp, of green creme de menthe. Bake as directed.
Take I can of Hershey's Fudge Topping, heat until it is easy to spread.
Spread over baked cake.
Take 19 oz. Cool Whip, add 3 tbsp. green creme de menthe, mix well.
Spread over topping on cake.