Start by preparing the broth so it can simmer while you prepare the chicken.
Heat the oil in a pot and add the scallions, ginger and garlic. Cook for 3-5 minutes, stirring often, until fragrant.
Pour in the broth, soy sauce, rice vinegar, and chili flakes (if using)
Warm the broth and then whisk in the miso paste. Let the broth gently simmer while preparing the chicken.
Heat the remaining oil in a skillet. Add the chicken thighs and cook for 4-5 minutes per-side until browned.
Whisk together the sauce for the chicken and pour it into the skillet.
Cook, basting the chicken for 5-7 minutes.
To serve, add the rice to a shallow bowl. Slice the chicken and place it next to the rice.
Pour the hot broth over everything. Garnish each bowl with toasted sesame seeds, scallions, fresh cilantro, and a wedge of lime if desired.