Chop the potatoes and the onion into thin slices

Fry the onion and the potatoes with enough oil to cover the slices, then take the máximum oil out of the mix with a strainer

Beat the eggs and add the onion and the potatoes in a bowl.

Use a flat pan to fry the mix till its bottom is cooked enough. Should take 3 to 5 min

Using a dish to cocer the pan, spin the omelet and fry the other half

Enjoy :D