In a small bowl, whisk together the coconut aminos, rice vinegar, tomato paste, arrowroot powder, garlic powder, and ginger powder until smooth.
Cut the chicken breast into bite-sized cubes and season 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 cook for 5-6 minutes, stirring occasionally, until golden brown and cooked through. Remove chicken from the pan and set aside.
In the same skillet, add the sliced bell peppers, red onion, and broccoli florets. Sauté for 4-5 minutes until the vegetables are tender-crisp.
Add the pineapple chunks and the cooked chicken back into the skillet with the vegetables.
Pour the prepared sauce over the mixture and toss well. Simmer for 1-2 minutes until the sauce thickens and becomes glossy, coating all ingredients evenly.
Serve immediately while hot.