1 graham cracker pie shell (may be chocolate)
4 oz. cream cheese
1 c. powdered sugar
1/3 c. peanut butter
1/3 c. milk
8 oz. container Cool Whip

Beat cream cheese, sugar, peanut butter and milk together for 5 minutes until smooth. Fold in Cool Whip and pour into pie shell. Freeze. Thaw for 20 minutes before serving.