1 (3 oz.) pkg. cream cheese
1/2 c. milk
1/2 c. peanut butter
1/3 c. sugar
1 (8 oz.) carton cool whip
1 graham cracker pie shell

Combine cream cheese, milk, peanut butter and sugar. Beat well until smooth. Fold in cool whip. Pour into baked and cooled pie shell. Chill at least 4 hours.