You can assemble this easy tuna noodle casserole recipe in advance (minus the breadcrumbs) and store it for 1-2 days. When ready to bake, let it come to room temperature for 30 minutes, add the topping, and bake. Once baked, allow it to cool, and then store it in the refrigerator tightly wrapped in plastic wrap (or in an airtight container) for 3-5 days.