Potatoes O'Brian can be used as well.

1 (32oz) package frozen shredded hash browns; thawed 1 can cream of potatoe soup 1 (16oz) container sour cream 2 cups shredded cheddar 1 cup grated parmesan cheese dash of salt & pepper

Preheat oven to 350.
Mix everything together!
Bake in greased baking dish for 1 hour.