Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Prepare the brown rice by combining 0.25 cup dry rice with 0.5 cup water in a small pot, bringing to a boil, then simmering covered for 40 minutes.
Cut the chicken breast into 1-inch bite-sized cubes and place them in a bowl with the broccoli florets.
Drizzle with avocado oil and season with sea salt and black pepper, tossing until everything is evenly coated.
Spread the chicken and broccoli in a single layer on the prepared baking sheet and roast for 15 to 18 minutes until the chicken is cooked through.
While roasting, whisk the orange juice, tamari, honey, grated fresh ginger, minced garlic, and cornstarch in a small saucepan over medium heat.
Stir the sauce constantly for 2 to 3 minutes until it thickens into a glossy glaze.
Remove the baking sheet from the oven, pour the orange glaze over the chicken and broccoli, and toss to coat before serving over the warm brown rice.