Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small bowl, whisk together the orange juice, coconut aminos, honey, minced ginger, minced garlic, sesame oil, and arrowroot powder until smooth.
Cut the chicken breast into 1-inch bite-sized cubes and season with sea salt and black pepper.
Place the chicken cubes and broccoli florets on the prepared baking sheet in a single layer.
Drizzle half of the orange sauce over the chicken and broccoli, tossing gently to coat.
Bake for 15 to 18 minutes, or until the chicken is cooked through and the broccoli is tender-crisp.
While the chicken bakes, pour the remaining sauce into a small saucepan and simmer over medium heat for 3-5 minutes until it thickens into a glaze.
Remove the tray from the oven, pour the thickened glaze over the chicken and broccoli, and toss to combine.
Garnish with red pepper flakes, sesame seeds, and sliced green onions before serving.