Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized 1-inch cubes and place them in a large mixing bowl with the broccoli florets.
In a small bowl, whisk together the fresh orange juice, coconut aminos, honey, arrowroot powder, minced garlic, grated ginger, and toasted sesame oil until smooth.
Season the chicken and broccoli with sea salt and black pepper, then pour half of the orange glaze over the mixture and toss until everything 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 even roasting.
Bake for 15 to 18 minutes, or until the chicken is cooked through and the broccoli is tender-crisp with slightly charred edges.
While the chicken bakes, simmer the remaining glaze in a small saucepan over medium heat for 2-3 minutes until it thickens into a syrupy consistency.
Remove the tray from the oven, drizzle with the thickened glaze, and garnish with sesame seeds and sliced green onions before serving.