8 oz. fat-free Cool Whip
1/2 c. reduced fat peanut butter
12 oz. (1 1/2 c.) frozen chocolate fat-free yogurt
3 oz. Grape-Nuts cereal (1/3 c.)

Let yogurt thaw so that is can be mixed. Mix all ingredients and pour into pie plate. Freeze for 2 to 3 hours. Cut into 10 pieces. Weight Watchers Points: 3.2 per slice.