American omelets are folded in half, whereas a French omelet is folded in thirds to encase its filling in a neat package. A professional chef folds an omelet and flips it out of the pan in one seamless motion, and you will, too, once you understand the following simple steps.
Stir the eggs until they are nearly set. Stop stirring and let the bottom of the omelet firm slightly.
Place the filling, if using, across the center of the omelet.
Push the omelet forward so the opposite side rises up.