2 cups green beans, diagonally cut into 1/2-inch pieces
4 medium carrots, sliced
2 medium onions, coarsely chopped
8 ounces thin spaghetti, uncooked, broken into 2-to 3-inch pieces
2 medium plum tomatoes, coarsely chopped
Salt and pepper, to taste
Mix ground turkey, egg whites, bread crumbs, 2 cloves of garlic, and 2 tablespoons of Italian seasoning until well blended; shape mixture into 32 meatballs. Spray large saucepan with cooking spray; heat over medium heat until hot. Cook meatballs until browned on all sides, 5 to 7 minutes.
Add chicken broth, water, green beans, carrots, onions, remaining 2 cloves garlic, and remaining 1 tablespoon Italian seasoning to saucepan; heat to boiling. Reduce heat and simmer, covered until vegetables are almost tender, about 8 minutes.
Heat soup to boiling; add pasta and tomatoes. Reduce heat and simmer, uncovered, until pasta is al dente, about 10 minutes. Season to taste with salt and pepper.