5 lb. potatoes, cooked
1 large pkg. cream cheese
1 pt. sour cream
1 stick butter
1 onion, chopped
salt and pepper to taste

Cream potatoes, cream cheese, sour cream and butter. Add onions, salt and pepper. Put in baking dish; top with butter and Parmesan cheese.

Bake at 350°F for about 30 minutes.