2 pkgs. instant vanilla pudding
3 c. milk
1 (8 oz.) carton sour cream
1 (9 oz.) Cool Whip
4 bananas
1 box vanilla wafers

Mix vanilla pudding and milk in large bowl. Fold in sour cream and Cool Whip.

Layer vanilla wafers on bottom of casserole dish, then bananas, then pudding mixture. Continue for three layers of each. Let set for at least 1 hour in refrigerator.