Place broth, water, shallot, garlic, star anise, cloves, ginger, chile peppers, cinnamon stick, lemongrass and lime leaves in a slow cooker.
Cook on low heat, covered for 4-5 hours.
Remove the star anise, cloves, lemongrass, lime leaves, chile peppers, ginger and cinnamon stick from broth.
Add the fish sauce and turn heat to warm until you have the rest of the soup ingredients ready.
Cook noodles according to package directions.
Drain and set aside.
Prepare the soup garnishes in small bowls for people to choose from.
To serve soup, fill bowls halfway with cooked rice noodles.
Top with hot broth and then sliced cooked chicken.
Top with optional soup garnishes.
Enjoy!