Mashed Potato Casserole - cooking recipe

Ingredients

8 large potatoes
1 small onion, grated
1 pt. sour cream
4 Tbsp. butter
1 c. grated Cheddar cheese

Preparation

Mash potatoes after cooking.
Add onion, sour cream and butter.
Place in a 2-quart casserole dish.
Top with cheese. Refrigerate overnight, then bake at 350\u00b0 for 1 hour.