Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small bowl, whisk together the fresh orange juice, coconut aminos, rice vinegar, honey, arrowroot powder, grated ginger, and minced garlic to create the orange glaze.
Cut the chicken breast into bite-sized cubes and slice the red bell pepper into strips.
Place the chicken, broccoli florets, and bell peppers in a large bowl, then toss with olive oil, sea salt, and black pepper until evenly coated.
Spread the chicken and vegetables in a single layer on the prepared baking sheet and roast for 15-18 minutes until the chicken is cooked through.
While the tray is roasting, pour the glaze mixture into a small saucepan over medium heat and simmer for 2-3 minutes until it thickens into a syrup-like consistency.
Remove the tray from the oven and transfer the roasted chicken and vegetables into a large bowl.
Pour the thickened orange glaze over the chicken and vegetables, tossing gently to ensure everything is well-coated.
Serve the orange chicken and broccoli over the warm cooked brown rice and garnish with toasted sesame seeds.