Combine crumbs and parmesan cheese. Dip veal into egg, then into crumbs.
Heat 1/4 cup oil in large skillet. Fry veal quickly on both side, just until golden brown.
Drain on paper towels, then place on ovenproof platter and arrange mozzarella cheese slices on top.
Bake at 350F for 5-10 minutes or until cheese is melted.
While veal is baking, saute onion and garlic in olive oil.
Stir in tomato sauce and oregano; heat to boiling.
Reduce heat and boil gently for 5-10 minutes.
Serve sauce over veal. Sprinkle with parmesan cheese, (if desired) Accompany with a cooked pasta.