Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the chicken breast into uniform 1-inch pieces and season evenly with sea salt and black pepper.
Arrange the chicken and broccoli florets on the prepared baking sheet, drizzle with sesame oil, and toss until lightly coated.
Roast in the oven for 15 to 18 minutes, or until the chicken is golden and reaches an internal temperature of 165°F.
While the chicken roasts, whisk the orange juice, zest, coconut aminos, rice vinegar, honey, ginger, garlic, and arrowroot powder in a small saucepan.
Bring the sauce to a simmer over medium heat, whisking constantly for 2-3 minutes until it thickens into a glossy glaze.
Transfer the roasted chicken and broccoli to a bowl, pour the warm orange glaze over them, and toss to coat before serving over the fluffy brown rice.