frozen hash browns, let thaw
1/2 c. chopped onion
1 (8 oz.) sour cream
1 can cream of mushroom soup
2 c. sharp or mild Cheddar cheese
salt to taste
1/2 stick butter
1 pkg. crackers, crumbled (put on top of casserole; optional)
1/2 stick butter, melted (poured over top of casserole; optional)

Bake at 350°F 20 to 30 minutes until bubbles real good.