Pat the chicken breast dry and cut into bite-sized cubes.
In a small bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until lightly coated.
Heat sesame oil in a large skillet or wok over medium-high heat.
Add the chicken to the pan and cook for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same pan, add the broccoli and bell peppers with a splash of water, covering for 2 minutes to steam-sauté until tender-crisp.
Whisk together orange juice, orange zest, tamari, honey, minced ginger, and minced garlic in a small jar.
Return the chicken to the pan and pour the orange glaze over the mixture, tossing for 1 minute until the sauce thickens and coats everything beautifully.
Serve the stir-fry immediately over the warm brown rice.