Prepare brownies as directed on box; cool completely. Prepare the chocolate pudding as directed on box. Pour about 1/4 of the pudding on the bottom of a trifle dish. Crumble 1/4 of the brownies over the pudding. Layer 1/3 of the Cool Whip over the brownies. Sprinkle 1/2 of the Heath Bar pieces over the Cool Whip. Repeat layers. Refrigerate and serve. ENJOY!