DIP brownies in melted chocolate, turning to evenly coat both sides of each. Top with sprinkles. Let stand at room temperature until chocolate coating is firm.
FOR each serving: Scoop 6 oz. ice cream into sundae glass; top with 2 oz. fudge topping, 3 Tbsp. whipped topping, 1/2 tsp. OREO Pieces and a cherry.
CUT 1 brownie diagonally in half. Use to garnish sundae.