In a small bowl, whisk together the honey, apple cider vinegar, coconut aminos, tomato paste, and arrowroot powder until smooth.
Heat the avocado oil in a large skillet over medium-high heat.
Season the chicken breast pieces with sea salt and black pepper.
Add the chicken to the skillet and sear until golden brown and cooked through, about 5-7 minutes.
Remove the chicken from the pan and set aside.
In the same skillet, add the red bell pepper, green bell pepper, red onion, minced garlic, and minced ginger, sautéing for 3-4 minutes until the vegetables are crisp-tender.
Stir in the pineapple chunks and cook for another minute to warm through.
Return the chicken to the skillet and pour the sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce thickens and coats the chicken and vegetables with a glossy finish.
Serve the sweet and sour chicken over steamed cauliflower rice.