Use fresh Parmesan cheese instead of pre-grated for a smoother sauce., Keep heat low after adding cream to prevent curdling., Add vegetables like spinach, mushrooms, bell peppers, or sun-dried tomatoes for extra flavor and nutrition., To lighten the sauce, substitute heavy cream with half-and-half or whole milk and reduce butter., For reheating, warm gently on the stove with occasional stirring and add a splash of milk or cream if needed to restore creaminess., Store leftovers in an airtight container in the fridge for 3-4 days; can freeze up to 2 months.