Mashed Potato Casserole - cooking recipe

Ingredients

3 to 4 large potatoes, boiled in skin and mashed
8 oz. cream cheese
8 oz. sour cream
8 oz. sharp cheese, grated
salt and pepper
1 onion, chopped
1 stick margarine

Preparation

Cream together potatoes, 1/2 of sharp cheese, sour cream, cream cheese and margarine.
Add salt and pepper.
Put in remaining cheese on top.
Cover.
Bake uncovered in 350\u00b0 oven for 1 hour.