Italian Meatloaf Recipe

1 egg, beaten
3/4 C. Italian bread crumbs
2 slices white bread, crumbled
1 T. milk
8 oz. shredded mozzarella cheese, reserve 3/4 C. for topping
1/4 C. Parmesan cheese
1 C. marinara sauce, plus 1/2 -3/4 C. more for topping