Tomato Tortellini Soup

This is a recipe I saw on Chanel 2 Noon News a few weeks ago. It's very easy and tasty!
Serves 4
1 tablespoon olive oil
1/2 cup minced onion (about 1/2 small onion)
1 glove garlic, minced
5 cups chicken broth
2 (14 -ounce) cans diced tomatoes
1 (9-ounce) package fresh tortellini
10-ounces fresh spinach - chopped
Salt and pepper to taste
1/2 cup freshly grated Parmesan, very loosely packed (I used mozzarella because I didn't have any fresh Parmesan and it worked just fine)

In a 3 quart soup pot, heat olive oil over medium heat. Saute the onion and garlic, stirring often until onions are soft, about 5 to 7 minutes. Add broth and tomatoes, turn heat up to high, and bring to a boil. Add the tortellini and cook according to package instructions. When tortellini is almost done, add spinach. Add salt and pepper as needed. Serve immediately. Garnish each serving with a sprinkling of cheese.