1 prepared chocolate cookie crust
1 can ready to spread vanilla frosting
1 c. peanut butter, smooth or chunky
1 c. sour cream
8 oz. carton frozen whipped topping, thawed

In large bowl, combine all filling ingredients except whipped topping; beat 2 minutes at medium speed. Fold in 1 cup whipped topping; pour into prepared crust. Spread remaining whipped topping over filling. Refrigerate at least 4 hours or until served. Store in refrigerator. Serves 8.