Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized cubes and toss them in a bowl with olive oil, sea salt, and black pepper.
Spread the chicken in a single layer on the baking sheet and bake for 15-18 minutes until cooked through and lightly golden.
While the chicken is roasting, whisk together the orange juice, tamari, rice vinegar, honey, arrowroot powder, minced ginger, and minced garlic in a small saucepan.
Place the saucepan over medium heat and simmer for 3-5 minutes, stirring constantly, until the sauce thickens into a glossy glaze.
Steam the broccoli florets in a steamer basket over boiling water for 4-5 minutes until they are tender-crisp and vibrant green.
Once the chicken is done, transfer it to a large bowl and pour the warm orange glaze over it, tossing until every piece is well coated.
Assemble the meal by placing the fluffy brown rice in a bowl, topped with the glazed chicken and steamed broccoli, then garnish with sesame seeds.