In a small bowl, whisk together the coconut aminos, rice vinegar, honey, tomato paste, arrowroot powder, garlic powder, and ground ginger until smooth.
Season the cubed chicken breast evenly with the sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté for 5-6 minutes until golden brown and cooked through.
Add the chopped red bell pepper, green bell pepper, and red onion to the skillet, cooking for 3-4 minutes until tender yet still crisp.
Stir in the fresh pineapple chunks and pour the prepared sauce over the mixture.
Simmer for 1-2 minutes, stirring constantly, until the sauce thickens and coats the chicken and vegetables thoroughly.
Remove from heat and serve immediately while the sauce is glossy and hot.