Tuna Noodle Casserole is a comforting dish made primarily from cooked egg noodles, canned tuna, and a creamy sauce, often made with cream of mushroom soup. It typically includes ingredients like peas, cheddar cheese, and onions, all baked together until bubbly and golden. This casserole is popular for its simplicity and convenience, as it uses pantry staples and can be prepared in one dish. It is often served as a family meal and can be customized with various vegetables or seasonings to suit individual tastes.