Omelet-Omelette | Commonly Confused Words

Omelet

/ˈɑːmlət/

A dish made by frying beaten eggs, often with added ingredients like cheese or vegetables

I hate omelet with cheese.

This word has no antonyms

/ˈɒmlət/

A dish of beaten eggs cooked in a frying pan; often mixed or filled with other ingredients like cheese, vegetables, or meat.

This word has no antonyms

Omelet is the American English spelling, while omelette is the British English and French spelling.
If youre reading or writing for an American audience, use omelet. For a British or international audience, omelette' is preferred.
Remember that the extra te at the end aligns with the British tendency to have longer spellings, like in colour vs. color.