Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and chop the broccoli into small florets.
Place the chicken and broccoli on the baking sheet, drizzle with avocado oil, and season with sea salt and black pepper.
Roast in the oven for 18-20 minutes, or until the chicken is cooked through and the broccoli is slightly charred.
While roasting, combine the orange juice, coconut aminos, rice vinegar, minced ginger, minced garlic, red pepper flakes, and arrowroot powder in a small saucepan over medium heat.
Whisk the sauce constantly until it begins to simmer and thickens into a glossy glaze, then remove from heat.
Prepare the cauliflower rice by steaming or sautéing in a separate pan until tender.
Transfer the roasted chicken and broccoli to a large bowl, pour the orange glaze over them, and toss until every piece is beautifully coated.
Serve the orange chicken and broccoli over the warm cauliflower rice.