Prepare the sauce. In a medium bowl, whisk together the soy sauce, brown sugar, yellow mustard, sriracha, and garlic.
In a non stick pan, heat the oil and cook the chicken thighs for 10 min each side or until all the way done. Cooking time will vary depending on the thickness of your chicken.
When chicken is done, pour the sauce into the pan and let simmer for 5 minutes until the sauce reduces a little. Then turn off heat.
Sprinkle with sesame seeds. Serve over white rice and stir fry veggies. Enjoy!