Both quiche and frittata are similar and made with a mixture of eggs and other mix-ins like cheese, meat, and vegetables, there are a few differences between the two. A quiche usually has a crust and a frittata does not (unless you are making a crustless quiche, of course). Frittatas are first cooked on the stovetop and finished in the oven, whereas quiches (like this crustless quiche) are baked entirely in the oven. Also, a crustless quiche usually contains cream or milk whereas a frittata does not. However, you will notice that my recipe subs Greek yogurt for the cream to add more protein while still creating a rich creamy texture!