Omelets are made with beaten eggs that are cooked into a flat round and then rolled or folded. They can hold virtually any savory or sweet food, from artichokes and zucchini to peanut butter and jam. The filling and topping possibilities are endless, limited only by the cook's imagination and refrigerator contents.
Simply put, a quiche is an unsweetened custard pie. Despite its fancy French name, a quiche is a wonderful foil for leftovers, a fact well known to smart restaurateurs who often call it the 'quiche of the day' and fill it with whatever undersold the previous day. It can be flavored with any chopped, well-drained food ranging from the most pedestrian to the most chic.