Continue to cook on a low heat for around 8-10 mins until the eggs are almost set on top then carefully take either a chopping board or plate and place it over the top of the frying pan then flip it over 180 degrees. At this point scrape out any residue from the bottom of the frying pan, and spray in some oil, so ensure the omelette doesn't stick, then carefully slide the omelette back into the frying pan wet side down to cook the other side.