Creamy Tortellini Soup

Name: Creamy Tortellini Soup
Ingredients: 1 medium yellow onion; 1 medium carrot; 1 medium celery stalk; 3 cloves garlic; 2 tablespoons olive oil; 1 1/2 teaspoons dried Italian seasoning; 1 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 3 tablespoons all-purpose flour; 1 (32-ounce) carton low-sodium vegetable or chicken broth (about 4 cups); 1 (28-ounce) can fire-roasted crushed tomatoes; 1 ounce Parmesan cheese (1/2 cup finely grated or 1/3 cup store-bought grated); 1 (8- to 9-ounce) package refrigerated cheese tortellini; 1/2 cup heavy cream; 5 ounces baby spinach (about 5 packed cups); 2 teaspoons balsamic vinegar