Cut the chicken breast into bite-sized pieces and place them in a bowl. Toss with the arrowroot powder, sea salt, and black pepper until evenly coated.
In a small mixing bowl, whisk together the coconut aminos, rice vinegar, tomato paste, raw honey, minced garlic, and grated fresh ginger to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken pieces to the skillet in a single layer. Cook for 3-4 minutes per side until the edges are crispy and the chicken is cooked through. Remove the chicken from the pan and set aside.
In the same skillet, add the sliced bell peppers and pineapple chunks. Sauté for 3 minutes until the peppers are tender-crisp.
Return the chicken to the skillet and pour the sauce mixture over the ingredients. Stir constantly for 1-2 minutes until the sauce thickens and coats everything in a glossy glaze.
In a separate small pan or the microwave, steam the cauliflower rice until tender.
Serve the crispy sweet and sour chicken immediately over the bed of cauliflower rice.