Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the fresh orange juice, coconut aminos, honey, toasted sesame oil, grated ginger, minced garlic, and arrowroot powder until the starch is fully dissolved.
Place the cubed chicken breast and broccoli florets into a large bowl, then season them with the sea salt and black pepper.
Pour exactly half of the prepared orange glaze over the chicken and broccoli, tossing thoroughly to ensure every piece is well-coated.
Spread the chicken and broccoli in a single layer on the prepared baking sheet, ensuring they are not overcrowded to allow for proper roasting.
Bake for 15 to 18 minutes, or until the chicken reaches an internal temperature of 165°F and the broccoli is tender-crisp.
While the chicken bakes, pour the remaining glaze into a small saucepan and simmer over medium heat for 3 to 5 minutes until it thickens into a glossy syrup.
Arrange the cooked brown rice in a bowl, top with the baked chicken and broccoli, drizzle with the thickened orange glaze, and finish with a sprinkle of sesame seeds.