Heath Bar Trifle
["1 (9 x 12-inch) baked chocolate cake", "1 (12 oz.) Cool Whip", "1 large box instant chocolate pudding, prepared according to directions", "6 Heath bars, crushed or Heath bar pieces", "chocolate or coffee liqueur (optional)"]
["Tear chocolate cake into pieces.", "Layer cake, pudding, Cool Whip, 3 of the crushed Heath bars, cake, liqueur, pudding, Cool Whip and remaining Heath bars (may have leftover cake). Refrigerate."]
["chocolate cake", "chocolate pudding", "chocolate"]