In a small bowl, whisk together the coconut aminos, rice vinegar, raw honey, tomato paste, garlic powder, and ground ginger until smooth.
Season the diced chicken breast evenly with 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 sear until golden brown and cooked through, approximately 6 to 8 minutes.
Remove the cooked chicken from the skillet and set it aside on a plate.
In the same skillet, add the sliced bell peppers and red onion, sautéing for 3 to 4 minutes until they are crisp-tender.
Stir in the fresh pineapple chunks and cook for 1 minute to allow them to warm through and slightly caramelize.
Return the chicken to the skillet and pour the prepared sauce over the mixture.
Toss all ingredients together for 1 to 2 minutes until the sauce thickens and coats the chicken and vegetables beautifully.