In a pot, heat sesame oil over medium heat.
Add minced garlic and sauté until fragrant.
Add chicken breasts and brown on both sides.
Pour in chicken broth and bring to a boil.
Reduce heat and let simmer for 15 minutes.
Remove chicken, shred it, and set aside.
Add ramen noodles to the broth and cook according to package instructions.
Stir in soy sauce, bok choy, and mushrooms.
Cook for an additional 5 minutes until vegetables are tender.
Serve the ramen in bowls, topped with shredded chicken, green onions, and chili flakes.