In a small bowl, whisk together the orange juice, tamari, honey, arrowroot powder, grated ginger, and minced garlic to create the glaze.
Cut the chicken breast into bite-sized cubes and season evenly with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sear until golden brown and cooked through, approximately 5 to 6 minutes.
Remove the chicken from the pan and set aside; add the broccoli florets and sliced bell pepper to the same pan with a tablespoon of water.
Cover the pan for 2 minutes to steam the vegetables until they are tender-crisp.
Return the chicken to the pan and pour the orange glaze over the chicken and vegetables.
Stir-fry constantly for 1 to 2 minutes until the sauce thickens and becomes glossy.
Serve the stir-fry over the warm cooked brown rice and garnish with freshly sliced green onions.