Heat oil in a Dutch oven over medium-high heat. Add onion; sauté 5 minutes or until tender. Add garlic; sauté 1 minute. Add broth and next 5 ingredients. Bring to a boil; cover, reduce heat, and simmer 10 minutes. Add tortellini; simmer, uncovered, 5 to 7 minutes or until pasta is tender. Ladle soup into bowls; sprinkle with Parmesan cheese.