In a large bowl, let cubed chicken marinate with 1-2 tbsp oil, salt and pepper until your skillet is ready.
In a large pot or skillet, heat oil until hot, but not smoking. Add diced onion and garlic, and cook until onions are translucent, stirring every few minutes. Add your chicken and spread out evenly so it can brown.
Once almost fully cooked, add your other ingredients: coconut aminos, honey, sesame oil and water, and stir. Separately in a small bowl, add a few tablespoons of water and 1 tbsp arrowroot or cornstarch (to thicken the sauce). Stir until completely dissolved before adding to your skillet. Give everything another good stir and let heat on medium for 5-7 minutes, covered.
Remove from heat, add 1/4 cup chopped green onion and 1 tbsp sesame seeds to skillet and stir. Serve over rice with sauteed broccolini and another sprinkle of green onion and sesame seeds. Enjoy! :)