Tips and Variations:

• Lighter Version: Substitute half-and-half or milk for the heavy cream for a lighter sauce.
• Add Vegetables: Incorporate peas, spinach, bell peppers, or other vegetables for added texture and nutrients.
• Gluten-Free Option: Use gluten-free pasta and replace the all-purpose flour with cornstarch or another gluten-free thickener.
• Crunchy Topping: For extra crunch, toast some breadcrumbs with melted butter and sprinkle them over the casserole before baking.

This refined version organizes the ingredients and steps clearly, provides helpful tips and variations, and includes suggested accompaniments for a well-rounded meal experience.