Gently simmering chicken pieces is the best way to get tender pieces of meat in the soup and to add flavor. You can use Chicken on the bone with the skin removed if you want a richer soup. I use chicken breasts for a healthier soup and lighter broth.  Bring the veggies and broth to a low simmer and then add the chicken. You don’t want to bring the broth to a rolling boil because it can actually make the chicken tough.