Spray large non-stick skillet with cooking spray and add 2 teaspoons of the
olive oil. Combine sausage with egg; mix lightly.
Sprinkle bread crumbs on shallow plate. Shape about a quarter of the sausage mixture into
flat patty and press into crumbs, lightly coating both sides. Make 3 more
coated patties with remaining meat and crumbs.
Brown patties in skillet
over medium heat for about 4 to 5 minutes, or until nicely browned. Add remaining 2 teaspoons of
oil and turn to brown other side evenly.
Mix tomato sauce with herbs. Top
each pattie with sauce and a slice of mozzarella cheese. Cover the pan and heat until hot and cheese is melted.