Chicken: In a large pan over medium heat, heat oil. Add cubed chicken thighs and cook until outside is golden brown and internal temperature reaches 165 degrees, flipping once, about 5 minutes on each side.
Sticky Sauce: While chicken cooks, prepare sauce by mixing together coconut aminos, fish sauce, monk fruit sweetener, garlic powder, ginger, and pepper.
Transfer cooked chicken to a plate and set aside.
Reduce stovetop heat to medium-low then, using a wooden spoon, scrape up browned bits from bottom of pan. Pour in sauce mixture and bring to a simmer. Stir in xanthan gum until a sauce forms.
Final Steps: Transfer cooked chicken back to pan. Stir to coat chicken in sauce before removing pan from heat.
Serve alongside or on top of your choice of vegetable and, optionally, garnish with freshly-cracked pepper, sesame seeds, and fresh parsley before serving.