1 finely chopped onion
1 (10.5 oz.) can condensed cream of mushroom soup
1/2 cup sour cream
1 (10.5 oz.) can condensed cheddar soup
2 cups shredded cheddar cheese (separated)
2. Combine all the ingredients except for one cup of cheddar cheese.
3. Spread the hash brown mixture into the pan and bake for 30 minutes.
4. Sprinkle remaining cheese on top of the casserole and bake for an additional 15 minutes.