1 (8 oz.) box cream cheese
1 c. sour cream
1/3 c. sugar
1 (8 oz.) container Cool Whip
2 tsp. vanilla
1 graham cracker pie crust (ready made)

Blend cream cheese until smooth. Gradually blend in sugar. Blend in sour cream and vanilla. Fold in Cool Whip. Pour into crust. Put in refrigerator for at least 4 hours to set.