1 yellow cake mix, baked as directed in a 9x13 pan, cooled completely
1 cup cold milk
1 pkg. (4-serving size) vanilla pudding
1-1/2 cups thawed Cool Whip
1 container chocolate frosting
Cut cake horizontally into two even layers with serrated knife; set aside. Pour 1 cup milk into large bowl. Add dry pudding mix. Beat with wire whisk 2 min. or until well blended. Gently stir in whipped topping. Let stand 5 min. to thicken. Place bottom cake layer on serving plate, or back in the 9x13 pan. Spread with pudding mixture; top with the remaining cake layer. Spread with chocolate frosting. Store in the refrigerator. (Could be made with two 8x8 pans and layered extra-tall, or used as two separate desserts: 1 for you, 1 for a friend!)
