Meanwhile, heat the olive oil over medium heat in a large pot. Add the onion, garlic, celery, and carrot. Stir often and cook for 4-5 minutes, until tender. Then add the bay leaves, parsley, shredded chicken, chicken broth/stock, and a few pinches each of kosher salt and pepper to taste. Stir well, cover, then simmer over medium heat for 10 minutes.