If a customer orders a breakfast sandwich made with an egg white omelet, what type of cheese is used?

The type of cheese is most likely cheddar. In this type of food, the cheese most commonly gritted as a mixture inside the omelet. The type of cheese that is the most easier to be gritted is cheddar.

The second most likely option is mozarella, because it is easily melt and could be placed on top of the omelet