Dice the chicken breast into bite-sized pieces and season evenly with sea salt, black pepper, garlic powder, and ground ginger.
In a small bowl, whisk together the coconut aminos, apple cider vinegar, honey, and arrowroot powder until the powder is fully dissolved.
Heat the sesame oil in a large skillet over medium-high heat until shimmering.
Add the chicken to the skillet and cook until golden brown and cooked through, approximately 6-8 minutes, then remove from the pan and set aside.
In the same skillet, add the diced bell peppers and red onion, sautéing for 3-4 minutes until they are tender yet still crisp.
Return the cooked chicken to the skillet along with the pineapple chunks.
Pour the prepared sauce over the chicken and vegetables, stirring constantly for 1-2 minutes until the glaze thickens and becomes glossy.
Serve the sweet and sour chicken immediately over the warm cooked brown rice.