https://www.foodkingcostplus.com/Recipes/Detail/4876/Potato_and_Cheese_Casserole
Yield: 10 servings
Grease a 13x9 inch baking dish. Mix together hash browns, onion, soup, sour cream and cheddar cheese. Spread into baking dish and pat down. Place butter slices on top and sprinkle with grated Parmesan. Cover with foil. Bake for 60-90 minutes, removing foil for last 15 minutes of cooking time to brown top.
Please note that some ingredients and brands may not be available in every store.
https://www.foodkingcostplus.com/Recipes/Detail/4876/Potato_and_Cheese_Casserole