Heat the oil in a 9-1/2 inch non-stick skillet over medium-high heat until it is hot but not smoking. Add the eggs, which will puff up, and cook, using a spatula to pull the eggs back from the edges of the skillet as they solidify, allowing the uncooked egg from the center to run out to the edges. When the omelette is evenly set on the bottom but there is still a fair amount of uncooked egg on top, cover the pan and let it cook until the surface of the omelette is nearly cooked through, about 4 minutes. Flip the omelette out onto a large plate, then slide it back into the pan and continue cooking until it is just cooked through, about 2 minutes. Slide back out onto a large plate and either eat hot, or at room temperature.