Both Frittata and quiche are egg bakes with similar stuffings, but they are slightly different in their eggs-to-dairy ratios, and the way they are cooked. Frittata originated in Italy, whereas Quiche is a French creation. In frittata, a small quantity of full-fat dairy is added to the eggs for richness, whereas a quiche recipe calls for a larger quantity of milk to achieve a custard-like finish. Traditional quiche recipes have a pie-crust as a base. Frittatas are always crustless.