Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into one-inch cubes and season evenly with sea salt and black pepper.
In a small mixing bowl, whisk together the fresh orange juice, coconut aminos, sesame oil, grated ginger, minced garlic, and arrowroot powder until the starch is fully dissolved.
Place the chicken cubes, broccoli florets, and chopped red bell pepper on the prepared baking sheet.
Drizzle half of the orange glaze over the chicken and vegetables, tossing well to ensure everything is coated.
Bake for 15 to 18 minutes, or until the chicken is cooked through and the broccoli edges are slightly charred.
While the chicken bakes, pour the remaining glaze into a small saucepan and simmer over medium heat for 2-3 minutes until it thickens into a glossy syrup.
Divide the cooked brown rice into bowls, top with the baked chicken and vegetables, and drizzle with the thickened glaze.
Garnish with sesame seeds and sliced green onions before serving.