1/2 pkg. (20 oz.) pkg. frozen hash brown potatoes, about 4 c.
1 can cream of potato soup
1 c. sour cream
1/4 c. chopped onion
1 c. grated cheddar cheese
Parmesan cheese

Combine all ingredients except Parmesan cheese in a 2 quart casserole dish. Sprinkle top of potatoes with Parmesan cheese. Bake, uncovered at 350 degrees for 1 hour, in a gas oven. Makes 4-6 servings.