Dice the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
In a small glass bowl, whisk together the honey, apple cider vinegar, coconut aminos, arrowroot powder, and water 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 to the skillet and cook until golden brown and the internal temperature reaches 165 degrees Fahrenheit, about 5-7 minutes.
Remove the cooked chicken from the pan and set it aside on a clean plate.
Add the sliced bell peppers and red onion to the same skillet, sautéing for 3-4 minutes until they are tender-crisp.
Stir in the pineapple chunks and cook for another 2 minutes until they are warm and slightly caramelized.
Return the chicken to the skillet and pour the prepared sauce over the meat and vegetables.
Toss everything together for 1-2 minutes until the sauce thickens into a glossy glaze that coats every piece.
Serve the stir-fry immediately over the warm cooked brown rice and garnish with a sprinkle of sesame seeds.