Rustic Meatball Noodle Soup

Name: Rustic Meatball Noodle Soup
Ingredients: For the meatballs; 1 1/2 pounds ground veal; 1/2 cup grated Parmesan cheese; 1/2 cup dry seasoned bread crumbs; 3 green onions, thinly sliced; 1 egg; 1/2 teaspoon black pepper; For the soup; 2 tablespoons olive oil; 1 large onion, chopped; 2 large stalks celery, sliced; 3 medium carrots, sliced into rounds or half rounds if thick; 4 cloves garlic, minced; 1/4 teaspoon crushed red pepper flakes; 1 bay leaf; 10 cups chicken broth; The previously made meat mixture; 4 ounces wide egg noodles; 1/2 cup chopped parsley; Salt and pepper to taste; Grated Parmesan for serving (optional)