Hash Browns with margarine

1 (16 ounce) package hash browns (the chopped up and not the shredded ones) 1 (8 ounce) carton sour cream , of any kind 1 (10 1/2 ounce) can cream of chicken[...]

2 lbs frozen cubed hash brown potatoes 2 (10 1/2 ounce) cans cream of mushroom soup 8 ounces sour cream 2 -3 cups grated cheddar cheese 1/2 cup chopped onion[...]