<human>:  What is the difference between a casserole and a quiche?
<bot>: The main difference between a casserole and a quiche is that a casserole is a type of dish that typically includes a variety of ingredients such as meat, vegetables, and a sauce, baked together in an oven-safe dish. A quiche is an egg-based dish that typically includes a savory custard and baked in a pie crust or tart shell. Another difference is that a casserole is often served as a main dish, while a quiche can typically be served as either a main or a side dish.