An amazing lush omelet with molten viscous cheese can be served for Breakfast and dinner. Preparing very quickly and easily. Hard cheeses, which are used in the original, in addition to Parmesan, are Cheddar and Gruyere. If you have only one kind of cheese, use only it and the omelet will still be wonderful. For this omelet, a pan with a heavy bottom of about 15-18 cm in diameter will be required.