Banana Pudding

2 packages vanilla pudding (3.4 oz)
3 c milk
8 oz sour cream
12 oz cool whip, thawed
12 oz box vanilla wafers
6 sliced bananas

Whisk pudding and milk in large bowl until thick. Whisk in sour cream. Fold in half the cool whip. Layer wafers, bananas and pudding. Repeat. Top with remaining cool whip. Cover and chill at least four hours before serving.