A casserole is a variety of a large, deep pan or bowl used for cooking a variety of dishes in the oven.the pan can be called a "casserole dish" or "casserole pan", whereas the food is simply "a casserole". The same pan is often used both for cooking and for serving. Casseroles are usually cooked slowly in the oven, often uncovered. They may be served as a main course or side dish, and, conveniently, may be served in the vessel in which they were cooked. A casserole, probably from the archaic French word case meaning a small saucepan, is a large, deep dish used both in the oven and as a serving vessel. The word is also used for the food cooked and served in such a vessel, with the cookware itself called a casserole dish or casserole pan .casserole pasta is actually one of the most popular food items in America .Although it is traditionally considered to be a dish for dinner, casserole pasta has also become popular among vegetarians and meat-lovers alike ,Casserole pasta is characterized by its dish-like quality that can be served both hot or cold - with all sorts of toppings like bread crumbs,meatt, cheese, olive oil, and butter. Protein, Starch, Vegetables, Sauce, and Cheese."