Optional additions (such as bean sprouts, lime wedges, toasted sesame seeds, soft boiled eggs)
In large pot, combine chicken broth, onions, ginger, garlic, cinnamon sticks, star anise, fish sauce (if using), soy sauce, and honey. Bring to a boil, then add chicken breasts or thighs and simmer, covered, until cooked through, about 20 to 25 minutes. Remove from heat. Remove chicken, cool, and then shred. Set aside.
Cook rice noodles according to package instructions.
Strain broth and discard solids.
To serve, divide cooked noodles among 8 bowls, top with shredded chicken, and ladle hot broth overtop.
Garnish with fresh herbs, bean sprouts, and lime wedges, if desired.