2 (24 oz.) pkgs. frozen shredded hash brown patties, thawed
2 cans potato soup, undiluted
1 1/2 c. sour cream
2 c. Sharp Cheddar cheese, shredded
1/2 c. Parmesan cheese

Combine ingredients, stirring well. Spoon into greased 9 x 13 inch baking pan. Bake at 350 degrees for 40 minutes or until lightly browned.