I call this Easter Potato Bake, but it's so good, you should make it for every holiday. Like Sundays. And Tuesdays.

32 oz frozen hash browns
1 chopped onion
 2 cans cream of mushroom soup
 1 16 oz tub sour cream
2 c grated cheddar cheese
 salt , pepper

  Mix all together, put in greased 9X13 pan, bake at 350 for 1.5 hours covered. Uncover for the last 15 minutes. Season with salt and pepper.