Prepare brownie mix and bake according to package directions in a 13 x 9 inch pan. Remove from oven when done, and prick top of warm brownies at 1-inch intervals with a fork; drizzle with Kahlua. Let cool, and crumble into chunks.
Prepare pudding mix according to package directions, omitting chilling. Place one-third or crumbled brownies in bottom of 3-qt. Trifle dish. Top with one-third of pudding, and one-third of Cool Whip, and one-third of crumbled Heath bars. Repeat layers twice, ending with crushed candy bars.
