Omelet and omelette are the same thing. The only difference is the spelling. Omelet is the American English version, while omelette is the British English version. Omelet first appeared in the early 17th century, so it’s not actually an American invention. Omelette is the modern French spelling. Although in France you can also see the word written “amelette” or “alemette”.  There may not be a difference between an omelet and an omelette. But there is a difference between an American omelette and a French omelette. A French omelette is most often served plain or with light fillings. They’re tightly folded and have a soft, pillow-like texture. An American omelette is thicker and crispier, commonly served with heavier fillings. French omelettes are rolled into a cylinder before serving, while American omelets are folded in half.