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 coconut aminos, apple cider vinegar, honey, minced ginger, and minced garlic to create the glaze.
Heat the avocado oil in a large stainless steel or cast iron skillet over medium-high heat.
Add the chicken to the skillet and sear until golden brown and cooked through, approximately 5-7 minutes, then remove from the pan and set aside.
In the same skillet, add the chopped red bell pepper, red onion, and pineapple chunks, sautéing for 3-4 minutes until the vegetables are tender-crisp.
Return the cooked chicken to the skillet and pour the prepared glaze over the mixture.
Stir constantly for 1-2 minutes until the sauce thickens and coats the chicken and vegetables thoroughly.
Remove from heat, drizzle with toasted sesame oil, and serve immediately over the warm cooked brown rice.