Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Toss the cubed chicken breast and broccoli florets with avocado oil, sea salt, and black pepper until evenly coated.
Arrange the chicken and broccoli in a single layer on the prepared baking sheet and roast for 15-18 minutes until the chicken is cooked through.
While the chicken roasts, combine the orange juice, coconut aminos, rice vinegar, honey, ginger, garlic, and arrowroot powder in a small saucepan.
Whisk the sauce over medium heat for 3-5 minutes until it reaches a simmer and thickens into a glossy, translucent glaze.
Place the roasted chicken and broccoli into a large bowl, pour the warm orange glaze over the top, and toss gently to coat.
Serve immediately, garnished with toasted sesame seeds and freshly sliced green onions.