Pat the chicken breast dry and cut into bite-sized cubes.
In a medium bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until each piece is lightly and evenly coated.
Whisk together the pineapple juice, coconut aminos, apple cider vinegar, grated ginger, and minced garlic in a small bowl 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 sear until golden brown and cooked through, approximately 5 to 6 minutes, then remove chicken and set aside.
In the same skillet, add the broccoli, bell peppers, and onion, sautéing for 3 to 4 minutes until tender-crisp.
Pour the prepared sauce over the vegetables and simmer for 1 to 2 minutes until the liquid begins to thicken into a glossy glaze.
Return the crispy chicken to the pan, tossing quickly to coat every piece in the sauce.
Steam the cauliflower rice separately until tender and serve the chicken stir-fry immediately over the top.