Chop the chicken into 1-inch pieces and place in a large bowl. Add in the minced garlic, ginger, and chili flakes. Season with a pinch of sea salt and stir to combine everything well.
Heat your oil in a large skillet or wok over medium heat.
Add your seasoned chicken pieces and cook until golden-brown and almost cooked through.
Add in your prepared green beans, bell pepper, and onion. Sauté for 5 minutes, or until veggies are just tender-crisp and chicken is fully cooked.
In a small bowl, whisk together your coconut aminos, water/broth, and Arrowroot/starch until there are no visible lumps.
Pour this sauce over your chicken and veggies.
Cook, stirring continuously, until the sauce thickens and nicely coats your chicken and veggies, around 2-3 minutes.
Garnish with sesame seeds and serve while hot.