1Make and bake brownie mix as directed on box for 13x9-inch pan. Poke warm brownies at 1-inch intervals with wooden pick and brush with liqueur. Let cool. Crumble brownies into small pieces. Crush candy bars; reserve 2 tablespoons for topping.
2Make pudding mix as directed on box, omitting chilling.
3In 3-quart trifle bowl, place half of crumbled brownies. Top with half each of pudding, candy bars and whipped topping. Repeat layers. Sprinkle with reserved crushed candy. Cover and refrigerate at least 8 hours.