Chicken Tortellini Soup

Bahan-bahan (8 porsi)

• 1 tablespoon olive oil
• ½ onion (chopped)
• 1 pound boneless skinless chicken breasts (cut into bite sized pieces)
• 1 carrot (chopped)
• 1 rib celery (chopped)
• 1 teaspoon Italian seasoning
• 1 (14.5 ounce each) can diced tomatoes (with juices)
• 6 cups chicken broth
• 1 (12 ounce each) package refrigerated cheese tortellini
• 2 cups chopped fresh spinach (or kale, lightly packed)
• 1 bay leaf
• shredded Parmesan cheese (for serving )