What ingredients are included in the cheese omelette?

The cheese omelette typically includes eggs mixed with a blend of cheddar and jack cheeses, creating a rich and creamy texture when cooked. The mention of a mayo/mustard mix on a croissant indicates that this particular preparation goes beyond just the omelette itself, integrating additional condiments and a different type of bread. This combination highlights a typical offering that might appeal to those who enjoy a flavorful twist on the classic omelette experience, making it a more complex dish rather than a simpler, more straightforward omelette.

Other options present different styles of omelettes but do not match the specific combination of ingredients in the correct answer. For instance, choices featuring pepper jack cheese and salsa or mozzarella and pesto suggest distinct regional or flavor influences that diverge from the standard cheese omelette expectations. The option with feta and spinach proposes a Mediterranean style, which caters to a different taste profile and also strays from the classic cheese omelette concept. Therefore, the correct selection aligns best with the traditional cheese omelette composition expanded with a unique serving style.