1 pkg. (8 oz.) cream cheese, softened
1/3 c. sugar
1 c. sour cream
1 (8 oz.) Cool Whip, thawed
1 graham cracker crust
Fresh strawberries, topping

Beat cheese until smooth; gradually beat in sugar. Blend in sour cream and vanilla. Fold whipped topping, blending well. Spoon into crust. Chill until set, at least 4 hours. Garnish with strawberries if desired.