Quick and Easy Casserole

1 lb hamburger
1 medium onion, chopped
24 oz pkg hashbrowns, thawed (southern style)
1 can cream of mushroom soup
1 cup sour cream
2 1/2 cups shredded cheddar cheese
2.8 oz can french fried onions

1. Brown hamburger with onion and 1/4 teaspoon salt. Drain.
2. In large bowl, combine hamburger, hash browns, soup, sour cream and cheese.
3. Spread in greased 9x13 baking dish.
4. Bake uncovered 40 minutes in 325 oven.
5. Top with french fried onions and bake for 10 more minutes.