Prepare the orange glaze by whisking together the orange juice, orange zest, tamari, minced ginger, minced garlic, arrowroot powder, and sesame oil in a small bowl.
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 until shimmering.
Add the chicken to the skillet and sauté for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same skillet, add the broccoli florets, sliced red bell pepper, and snap peas, stir-frying for 3-4 minutes until they are bright and crisp-tender.
Return the chicken to the skillet and pour the orange glaze over the mixture, tossing constantly for 1-2 minutes until the sauce thickens and coats everything beautifully.
Serve the stir-fry immediately over the warm cooked brown rice.