1-2-3 Toffee Cake

1 (18.25 ounce) box chocolate cake mix
6 to 8 toffee candy bars, frozen
1 (12 ounce) container Cool Whip

The night before bake the chocolate cake in a 13 x 9-inch baking pan. Cool and refrigerate.

One hour before serving, crush frozen toffee and stir into Cool Whip. Spread on chilled cake and return to refrigerator until ready to serve.