32 oz. pkg. frozen hash brown potatoes, thawed
2 cans potato soup, undiluted
2 (8 oz.) carton sour cream
2 c. shredded sharp Cheddar cheese
1 c. grated Parmesan cheese

Combine all ingredients, stirring well. Put in greased 9 x 13 inch baking dish. Bake at 350 degrees for 40-50 minutes.