Combine chicken, soy sauce, black vinegar, sesame seeds and fish sauce together in a bowl. Mix well. Let set for 20 minutes.
Heat avocado oil in a large skillet or walk over medium high heat.
Once hot add in chicken and marinade. Cook until chicken is browned and cooked through 5 - 7 minutes. Sprinkle corn starch over the top. Cook until it starts to thicken. Add in chicken broth and mix well. Sauce will start to thicken.
Add in nira chives and cook until they wilt, 2 - 3 minutes. Serve over rice or quinoa.