Whip the eggs with a little salt in a flattish bowl.
Sprinkle the flour over one plate and the bread crumbs over another.
Make two ham and mozzarella sandwiches, using two slices of bread for each. Make sure to use up all the ham and cheese (if you have any mozzarella left over, you can nibble at it while you work).
Cut each sandwich in half.
Heat enough oil to come about half an inch up the side of your frying pan.
Holding each sandwich together firmly, dip them first in the flour on all sides, then in the egg, and then in the bread crumbs so that they are well coated.
Fry them over medium heat until they are golden on both sides.
Lift them out onto a plate lined with paper towels to soak up the excess oil. Serve immediately.