Prepare the brown rice according to package instructions so it is warm and ready for serving.
In a small mixing bowl, whisk together the orange juice, tamari, honey, grated ginger, minced garlic, and arrowroot powder until the glaze is smooth.
Cut the chicken breast into bite-sized pieces 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 sauté until golden brown and cooked through, approximately 5 to 7 minutes.
Remove the chicken from the pan and set it aside on a plate.
Add the broccoli florets and sliced red bell pepper to the same skillet with a tablespoon of water, covering for 2 minutes to steam until tender-crisp.
Return the chicken to the skillet and pour the prepared orange glaze over the chicken and vegetables.
Stir-fry constantly for 1 to 2 minutes until the sauce thickens into a glossy, vibrant coating.
Serve the orange chicken and vegetables over the bed of brown rice and garnish with sliced green onions and sesame seeds.