Cut the chicken breast into 1-inch cubes and season evenly with sea salt, black pepper, garlic powder, and ground ginger.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and arrowroot powder until the starch is fully dissolved.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken cubes to the skillet and sauté for 5-6 minutes, turning occasionally, until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
Add the chopped red bell pepper, sliced red onion, and pineapple chunks to the same skillet and stir-fry for 3-4 minutes until the vegetables are tender-crisp.
Return the cooked chicken to the skillet with the vegetables and pour the sauce mixture over everything.
Toss constantly for 1-2 minutes until the sauce thickens into a glossy glaze that coats the chicken and vegetables.
Serve the sweet and sour stir-fry immediately over the warm cooked jasmine rice.