Whisk all ingredients for the sauce together in a bowl. Set aside.
Toss the chicken pieces in the tapioca starch until evenly coated.
Heat a large skillet over medium heat. Add the avocado oil, then stir in the chicken and season with ½ tsp sea salt. Allow to cook, stirring occasionally, until cooked through (about 9-12 minutes).
Add the sauce and cashews. Reduce heat to a simmer. Allow to simmer until sauce slightly thickens, about 5-7 minutes. Serve with fresh chives and sesame seeds (optional).
