Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized cubes and season evenly with sea salt and black pepper.
In a small mixing bowl, whisk together the fresh orange juice, orange zest, coconut aminos, honey, minced ginger, minced garlic, and arrowroot powder until smooth.
Place the chicken cubes and broccoli florets onto the prepared baking sheet, drizzle with toasted sesame oil, and toss to coat.
Pour half of the prepared orange sauce over the chicken and broccoli, tossing again to ensure every piece is well-coated.
Spread the mixture into a single layer and bake for 15-18 minutes, or until the chicken is cooked through and the broccoli is tender-crisp.
While the chicken bakes, pour the remaining orange sauce into a small saucepan over medium heat and simmer for 2-3 minutes until it thickens into a glossy glaze.
Arrange the cooked brown rice in a bowl, top with the baked chicken and broccoli, and drizzle with the thickened orange glaze before serving.