In another bowl add the egg and whisk it.
In a third bowl add the bread crumbs and salt and mix.
Roll the cheese in the flour, then in the egg mix (make sure to cover them well) and then in the bread crumbs.
Spray both sides with sunflower oil.
Place in the basket of the air fryer.
Set the temperature at 180 degrees Celsius, and cook for 5 minutes.
Take out and eat warm as they are or together with a dip sauce.