Whisk the eggs for 2 minutes and let the foam subside.
Heat a nonstick pan on medium-high heat for 20 seconds. Add butter; when it foams, add the eggs.
Season with salt and pepper.
Move the eggs around in the pan with a rubber spatula as if you're making scrambled eggs.
When the omelette starts to set, flip it over.
Sprinkle cheese on top, fold and transfer onto a plate.
Courtesy of Adam Roberts