Make sure the cream cheese is soft before mixing it into the sauce for a smooth consistency. For extra flavor, consider adding sautéed mushrooms or peas. Don't skip out on the cheese topping; it creates a tasty, gooey crust that enhances the overall dish. Casserole can be stored in an airtight container for up to 3-4 days. Reheat in the oven or microwave, adding a splash of chicken broth if needed.