The Key to Perfect Cheesy, Tender Omelettes
Making the perfect, sticky, filled cheese omelet can be tricky without overcooking the eggs, but Serious Eats has a tip to help you: Toss the filled cheese first, then pour over the omelets. This is how it works.
Filled omelets usually have other ingredients (like ham or vegetables) that need to be cooked before adding them to the eggs in the skillet. Resist the temptation to cook the filling along with the eggs, otherwise you will be over. Instead, cook the filling first and then stir in the grated cheese with the filling as you take them out of the pan to start cooking the eggs.
It’s a simple step, but adding the warm filling to the cheese before adding it back to the eggs will start to melt the cheese from the heat of the filling. By the time the eggs are ready, you pour everything and roll, everything will be perfect. Heat a little more when the eggs are finished in the skillet for the perfect cheese omelet. The Food Lab: A Quick Guide to Filling Omelettes | Serious food