Heat oven to 350°. Prepare brownie mix as directed on package for 13 ×9-inch rectangular pan, using water, oil and egg product and stirring coffee into batter. Bake and cool as directed.
Cut brownies into 1-inch squares. Place half of the brownie squares in bottom of 3-quart glass bowl. Prepare pudding mix as directed on package for pudding, using skim milk. Pour half of the pudding over brownies in bowl. Top with half each of the toffee bits and whipped topping. Repeat with remaining brownies, pudding, toffee bits and whipped topping. Sprinkle with reserved toffee bits.
Cover and refrigerate at least 4 hours before serving. Cover and refrigerate any remaining trifle. Yield: 20 servings.