Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized cubes and season them with sea salt and black pepper.
In a small mixing bowl, whisk together the fresh orange juice, coconut aminos, sesame oil, arrowroot powder, grated ginger, and minced garlic until smooth.
Spread the chicken cubes and broccoli florets across the prepared baking sheet in a single layer.
Pour half of the orange sauce over the chicken and broccoli, tossing well to ensure every piece is evenly coated.
Bake for 15 to 18 minutes, or until the chicken is cooked through and the broccoli is tender-crisp.
Remove from the oven and drizzle the remaining sauce over the hot chicken and broccoli.
Serve immediately over the cooked brown rice and garnish with a sprinkle of sesame seeds.