Mashed Potato Casserole - cooking recipe

Ingredients

5 lb. potatoes, cooked and mashed
6 oz. cream cheese
1 c. sour cream
2 tsp. onion salt
1/4 tsp. pepper
2 Tbsp. butter

Preparation

Mix together and put into buttered casserole dish.
Dot with butter.
Bake at 350\u00b0 covered.