The Ninety Calorie Banana Split
["1 (4 oz. size) pkg. Jell-O brand watermelon flavor sugar-free gelatin", "1 c. boiling water", "1/2 c. cold water", "2 medium bananas", "1/2 c. thawed Cool Whip lite whipped topping", "1 Tbsp. chopped walnuts"]
["Dissolve gelatin completely in boiling water in medium bowl. Stir in cold water.", "Pour mixture slowly into an 8-inch square pan.", "Refrigerate at least 3 hours or until firm.", "Cut gelatin into 1/2-inch cubes.", "Divide gelatin cubes into 4 dessert dishes. Halve and split bananas.", "Just before serving, place 2 pieces in each dish.", "Top with whipped topping.", "Sprinkle with walnuts."]
["gelatin", "boiling water", "cold water", "bananas", "topping", "walnuts"]