Whisk together the pineapple juice, coconut aminos, rice vinegar, tomato paste, arrowroot powder, garlic powder, and ground ginger in a small bowl to create the sauce.
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 until shimmering.
Add the chicken to the skillet and sauté until golden brown and cooked through, approximately 5 to 7 minutes, then remove from the pan and set aside.
In the same skillet, add the bell peppers, red onion, and broccoli florets, sautéing for 4 to 5 minutes until tender-crisp.
Stir in the pineapple chunks and cook for 1 minute to allow them to warm through and slightly caramelize.
Return the cooked chicken to the skillet and pour the sauce over the mixture.
Toss everything together for 1 to 2 minutes until the sauce thickens into a glossy glaze that coats every piece.