In a medium saucepan on medium heat, combine broth and 3 cups water. Bring to a boil, then reduce to a simmer. Add chicken and, if desired, parsley. Cook for 6 minutes, adjusting heat to maintain a gentle simmer. Remove from heat and let stand until chicken is cooked through, about 15 minutes.
You can serve this rich and flavorful braised chicken traditionally over dumplings or noodles, but it's also good served over mashed butternut squash, roasted root vegetables or grains such as brown rice or farro. Once you've mastered it with chicken, try it with pork, beef or lamb.