Dice the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, apple cider vinegar, honey, arrowroot powder, minced ginger, and minced garlic to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, then remove the chicken and set it aside.
In the same skillet, add the sliced red bell pepper, snap peas, and red onion, cooking for 3-4 minutes until they are tender-crisp.
Return the cooked chicken to the skillet and add the pineapple chunks.
Pour the prepared sauce over the mixture and toss constantly for 1-2 minutes until the sauce thickens into a glossy glaze that coats all ingredients.
Steam the cauliflower rice separately and serve the sweet and sour stir-fry immediately over the rice.