In a large bowl, combine the first eight ingredients. Crumble beef over mixture and sprinkle with cracker crumbs; mix gently. Shape into 1-inch balls. Place in un-greased 15-by-10-by-1-inch baking pans. Bake at 350 degrees for 20–25 minutes or until meat is no longer pink. Drain on paper towels.
In a large saucepan, combine the tomato sauce, Parmesan cheese, oregano, basil, parsley and salt. Bring to a boil over medium heat; add meatballs. Reduce heat; cover and simmer for 20 minutes or until heated through. Serve meatballs and sauce on buns. Top with mozzarella cheese if desired.
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