To a small bowl, mix together 1/4 cup water and arrowroot powder (or corn starch). Once mixed, add coconut aminos (soy sauce), honey, rice wine vinegar, and ginger. Mix well, and set aside.
Stir-Fry
To a skillet, add coconut oil on medium heat. Once oil has melted, add minced garlic 1-2 minutes until garlic becomes fragrant. Add diced onion 4-5 minutes. Just enough time for onions to become translucent.
Add diced chicken and cook for 5-6 minutes. Stir skillet and cook other side. Once chicken is done (no longer pink), add stir fry veggies, mix with chicken and onions, and saute for 3-4 minutes.
Add Teriyaki sauce (step 1) and mix well. Sauce will thicken after 2-3 minutes. Once sauce bubbles, remove from heat. Garnish with green onions, if desired. Serve immediately.