Pat the chicken breast dry with paper towels and cut into 1-inch bite-sized cubes.
In a medium bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
In a small glass jar, whisk together the orange juice, tamari, honey, grated ginger, and minced garlic to create the glaze.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and sear for 3-4 minutes per side until golden brown and crispy.
Add the broccoli florets and sliced red bell pepper to the pan, stir-frying for another 3 minutes until the vegetables are tender-crisp.
Pour the orange glaze over the chicken and vegetables, tossing constantly for 1-2 minutes as the sauce thickens and coats everything beautifully.
Remove from heat and drizzle with toasted sesame oil for an aromatic finish.
Serve the stir-fry immediately over the warm cooked brown rice.