In a Dutch oven, heat oil over medium-high heat. Add onion, carrot and celery; cook and stir until tender. Add garlic; cook 1 minute longer. Add broth, vegetables, macaroni and seasonings. Bring to a boil.
Reduce heat; simmer, uncovered, 5 minutes or until macaroni is al dente. Stir in turkey and zucchini; cook until zucchini is crisp-tender. Discard bay leaf. If desired, sprinkle servings with cheese. Yield: 6 servings (2 quarts).