Season the chicken breast with sea salt and black pepper on both sides.
Heat the toasted sesame oil in a medium pot over medium-high heat and sear the chicken until golden and cooked through, about 5-6 minutes per side.
Remove the chicken from the pot, let it rest for a few minutes, then slice it into thin strips.
In the same pot, add the minced garlic and grated fresh ginger, sautéing for 1 minute until fragrant.
Pour in the chicken broth, tamari, and sriracha, bringing the mixture to a gentle boil.
Add the brown rice ramen noodles to the boiling broth and cook according to the package instructions, usually about 3-4 minutes.
During the final minute of cooking the noodles, stir in the chopped baby bok choy until it is just wilted and bright green.
Pour the soup and noodles into a large bowl, top with the sliced chicken strips and fresh scallions, and serve immediately.