1 lg. container Cool Whip
1 pkg. sm. Heath bars
1 pkg. light Jello chocolate mousse (NOT pudding)
1 pkg. dark Jello chocolate mousse (NOT pudding)
1 (10-12 inch) devils food cake, baked according to directions

Prepare mousse in 2 separate containers and refrigerate. Crush Heath Bars; crumble cake into large pieces.

Heath Bar, light mousse, Cool Whip, cake, Heath Bar, dark mousse, Cool Whip, cake, etc. Top with Cool Whip sprinkled with Heath Bar crumbs.