1To make trifles, cut brownies into 1/2-inch squares. Place layer of brownie squares in bottom of trifle bowl or 4 to 6 deep wine glasses. Spread layer of pudding over brownies.
2In medium bowl, stir together frosting and thawed whipped topping until smooth. Spread layer of frosting mixture over pudding mixture.
3Repeat with second layer of brownies, pudding and frosting mixture. If desired, garnish with fresh berries and mint sprigs. Store in refrigerator.