1 pkg. chocolate cake mix, baked and cooled
1 pkg. instant pudding mix (chocolate, banana cream, or pistachio)
1 med. size container Cool Whip

Cut cake into 2 inch squares. Make pudding according to directions on package. In large bowl, layer cake, pudding, and Cool Whip; repeat, ending with Cool Whip on top. Cover and refrigerate for 2 hours before serving. Garnish with chocolate chips or sprinkles if you like before serving.