Lynne's Potato Supreme

2 lbs frozen hash browns
1 cup chopped onions
1 can cream of chicken or cream of mushroom soup
1 lb sour cream
1 stick margarine
8 oz shredded cheddar or mixed cheese
(Optional) Bread crumbs or French's Onions
  1. Mix all ingredients together.
  2. Place in a 9x13 pan and bake at 375 degrees for 50 minutes to 1 hour.
  3. If using topping, top with bread crumbs or French's Onions and brown for 10 minutes.