A two-egg omelette folded over sautéed chicken, onion and cheese, with parmesan grated over the top. Two minutes a side. One serving, ten minutes.
Two minutes a side is the answer for an omelette this size, and the signal is the base: it is ready to turn when it slides in the pan instead of sticking. The chicken and onion are cooked separately and put in at the end, so nothing raw goes near the egg. Beat the eggs only until the yolk and white are combined. Beating longer works air in and gives a puffier omelette that collapses on the plate. Keep the heat moderate: high heat browns the outside before the inside sets, and an omelette should be pale.