Heat the olive oil in a large pot over medium heat. Add the onion, garlic, carrots, and celery, and cook until the vegetables are softened, about 8 minutes.
Stir in the thyme, oregano, chicken broth, and bay leaf. Increase the heat to high and bring the soup to a boil. Reduce the heat to low and simmer for 10 minutes.
Stir in the cooked chicken, diced tomatoes, peas, and parsley. Simmer for 5 minutes, or until heated through.
Remove the bay leaf and season the soup with salt and pepper to taste.
Serve hot.
Interesting Facts
California Chicken Soup is a popular dish in the United States.
This soup is a great way to use up leftovers, as you can add any cooked vegetables you have on hand.
This soup can be made with any type of cooked chicken, such as rotisserie chicken.