Combine 1 tablespoon olive oil and garlic in a large microwave-safe bowl, and microwave at high for 45 seconds. Add the broth; microwave at high 4 minutes or until mixture simmers. Gradually stir in couscous; cover and let stand 5 minutes. Fluff with a fork. Stir in the tomato, chicken, basil, vinegar, salt, and pepper. Drizzle with 1 tablespoon oil, and sprinkle with cheese.