In a small bowl, whisk together the coconut aminos, apple cider vinegar, fresh ginger, minced garlic, and arrowroot powder to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the diced chicken breast to the skillet, season with sea salt and black pepper, and sauté until golden brown and cooked through.
Remove the chicken from the pan and set aside. In the same pan, add the bell peppers, red onion, and pineapple chunks.
Sauté the vegetables and fruit for 3-4 minutes until the peppers are tender-crisp.
Return the chicken to the skillet and pour the sauce over the mixture, stirring constantly for 1-2 minutes until the glaze thickens and coats everything evenly.
In a separate small pan, lightly steam the cauliflower rice and then stir in the cooked brown rice until well combined.
Serve the sweet and sour chicken immediately over the warm rice blend.