2 c. (16 oz.) sour cream
1/3 c. chopped onion
1 tsp. salt
1/2 c. bread crumbs (for topping)
1 can cream mushroom soup (undiluted)
1 1/2 c. shredded Cheddar cheese
3 lb. potatoes (about 9 medium potatoes)

Mix sour cream, soup, onion, seasonings (may add some pepper, if desired) and 1 cup of the Cheddar cheese together in greased casserole with potatoes (which have been boiled to approximately half-done stage). Top with rest of cheese and crumbs and bake at 350°F for about an hour.