Pat the chicken breast dry with a paper towel and cut into bite-sized pieces, then season with sea salt and black pepper.
In a small bowl, whisk together the fresh orange juice, coconut aminos, and arrowroot powder to create the glaze base.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-6 minutes, turning occasionally, until golden brown and cooked through; remove chicken and set aside.
In the same skillet, add the broccoli florets and sliced red bell pepper, sautéing for 3-4 minutes until tender-crisp.
Stir in the minced garlic and grated fresh ginger, cooking for 30 seconds until fragrant.
Return the chicken to the skillet and pour the orange glaze mixture over the top.
Stir constantly for 1-2 minutes until the sauce thickens and coats the chicken and vegetables in a glossy sheen.
Serve the stir-fry immediately over warm cooked brown rice and garnish with sesame seeds.