A frittata and quiche are both main course egg dishes that at first glance appear very similar; however, there are important differences between the two. A frittata is Italian in origin. It's cooked in an oven-safe skillet and It has a firmer texture, with a higher ratio of eggs to cream. In fact, it may not include any dairy products at all. Frittatas are partially cooked on the stove, then baked or broiled until set. They usually include lots of vegetables. Quiche, including crustless quiches, originated in France. Quiches are always baked, usually in a pie dish; they have a custard-like texture, and usually include a good amount of cream, and fewer vegetables than a frittata.