Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Dice the chicken breast into uniform 1-inch cubes and place them in a mixing bowl.
Toss the chicken with avocado oil, garlic powder, ground ginger, sea salt, and black pepper until evenly coated.
Spread the chicken cubes in a single layer on the prepared baking sheet and bake for 15-18 minutes until cooked through.
While the chicken is baking, combine the orange juice, coconut aminos, honey, and arrowroot powder in a small saucepan.
Whisk the sauce over medium heat for 3-5 minutes until it thickens into a glossy, translucent glaze.
Steam the broccoli florets in a steamer basket for 4-5 minutes until they are vibrant green and tender-crisp.
Remove the chicken from the oven and transfer to a bowl; pour the orange glaze over the chicken and toss to coat thoroughly.
Serve the glazed chicken over the warm cooked brown rice with the steamed broccoli on the side.
Garnish the dish with sesame seeds and sliced green onions before serving.