You will need carrots, celery, onions, flour, parmesan, pepper, oregano, basil, garlic, bay leaf, salt, butter, chicken broth, diced tomatoes, half & half, and tortellini.
Add the roux mixture back to the soup. When the soup begins to thicken, add the parmesan and half and half. Stir until the cheese is melted and add more salt and pepper, if necessary.