Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and season evenly with sea salt and black pepper.
Arrange the chicken cubes and broccoli florets on the prepared baking sheet in a single layer.
Bake for 15-18 minutes until the chicken is cooked through and the broccoli is tender-crisp.
While the chicken bakes, whisk together the orange juice, orange zest, 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 or sauté the cauliflower rice in a separate pan until heated through and soft.
Toss the baked chicken and broccoli in the orange glaze until well coated, then serve over the cauliflower rice and drizzle with sesame oil.