Make sure to fully thaw your hash browns and squeeze out any excess moisture to prevent a soggy casserole. For an extra crispy top, switch your oven to broil for the last 2-3 minutes, watching carefully to avoid burning. Use freshly shredded cheddar cheese for better melting and flavor. You can customize the recipe with spices, different cheeses, or add protein. It can be made vegetarian by substituting the cream of chicken soup. Leftovers keep well refrigerated for 3-4 days and can be frozen before baking for up to 2 months.