Prepare brownie batter and bake according to package directions. Cool; cut into 1-in. pieces.
In a large bowl, beat milk and pudding mixes for 2 minutes or until thickened. Stir in coffee. Fold in whipped topping.
In a trifle bowl or 2-qt. glass bowl, layer a third of the brownie pieces, pudding mixture and crushed candy bar. Repeat layers twice. Chill until serving.