Add broth and soy sauce; bring to boil. Add baby bok choy; cook for 2 to 3 minutes or until tender.
Divide rice noodles among 4 bowls; top with broth and vegetables. Garnish with green onions and cilantro. Serve with lime wedges. Serve with drizzle of hot sauce and vegetarian hoisin sauce if desired.
Recipe Notes
*Substitute Thai basil and/or mint for cilantro if desired.