This potato omelette is perfect for brunch because its so filling and comes together quite quickly. The trick is to chop up the potatoes into small cubes which speeds up the cooking process and allows them to get nice and crispy. You can make it without onions, but adding the onions in there gives it a wonderful sweet depth of flavour, so I tend to not skip them! You can serve it with pita bread and top it with fresh vegetables or some feta cheese if you like.