In a small bowl, add all sauce ingredients and whisk together. Set aside.
In medium bowl, add cubed chicken and arrowroot flour, salt and pepper. Set aside.
In a large skillet over medium heat, add sesame oil. Toast the garlic and red pepper flakes until fragrant, about 30 seconds to 1 minute. Add chicken to the skillet and cook, stirring occasionally, until crispy on all sides, about 7 to 8 minutes.
Stir the sauce one more time, then add to the skillet with the chicken. Stir until sauce is thickened, about 2 minutes. Serve immediately!
Notes
If you're not doing Whole30, you can sub the arrowroot flour for cornstarch.
Leftovers keep well in the fridge for up to 4 or 5 days.
Dish pairs well with white rice, cauliflower rice, or on its own.