Spray large non-stick skillet with cooking spray and add 1 teaspoon of the olive oil. Combine turkey sausage with egg and lemon peel; mix lightly. Sprinkle bread crumbs on shallow plate. Shape 1/4 of meat 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 moderate heat, for about 2 to 3 minutes. Add remaining teaspoon of oil and turn to brown other side evenly. Mix tomato sauce with herbs. Top each with sauce and a slice of mozzarella.