STIR boiling water into gelatin in large bowl at least 2 minutes until completely dissolved. Stir in cold water. Reserve 1 cup of the gelatin; set aside at room temperature. Refrigerate remaining gelatin 1-1/4 hours or until thickened.
RESERVE 1/4 cup of the berries for garnish. Stir remaining berries into thickened gelatin; pour evenly into 8 dessert glasses. Add 1 cup of the whipped topping to reserved 1 cup gelatin; stir with wire whisk until well blended. Spoon over gelatin in glasses.
REFRIGERATE 4 hours or until firm. Top with remaining 1/2 cup whipped topping and reserved berries just before serving. Garnish with fresh mint leaves, if desired. Store leftover desserts in refrigerator.
