Bake cake in 9 x 13 pan. Cool. Cut into squares, about 1". Make pudding using milk and kahlua. Crush frozen Heath Bars with a hammer. In a deep bowl or trifle dish, put a layer of cake, pudding, Cool Whip then Heath Bars. Repeat layers. Refrigerate for a couple hours.
Ingredients
1 package Devil's Food cake mix
2 small Chocolate instant pudding
3 1/2 cups Milk
1/2 cup Kahlua
1 small Cool Whip
6 Heath bars , stored in freezr