Au Gratin Potatoes

1 pkg. frozen hash browns
1/2 ctn. sour cream
1 can cream of celery soup
1 can cream of chicken soup
1/4 to 1/2 c. milk
12 oz. grated Cheddar cheese
Grated onion (opt.)
Salt & pepper, to taste

Partially defrost potatoes. Combine all ingredients. Spread evenly in pan and bake at 350° for 45 minutes to 1 hour.