Cut the chicken breast into bite-sized cubes and season with sea salt and black pepper.
In a small bowl, whisk together coconut aminos, rice vinegar, honey, tomato paste, and arrowroot powder to create the sauce.
Heat 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, about 5-7 minutes.
Remove chicken from the pan and set aside.
Add the sliced bell peppers, red onion, and pineapple to the same skillet, stirring frequently for 3-4 minutes until the vegetables are tender-crisp.
Stir in the minced garlic and grated ginger, cooking for 30 seconds until fragrant.
Return the chicken to the skillet and pour the sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce has thickened and coats the chicken and vegetables beautifully.