Cut 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, rice vinegar, honey, minced ginger, and minced garlic to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the seasoned chicken to the skillet and cook until golden brown and fully cooked through, approximately 5 to 7 minutes.
Remove the chicken from the skillet and set aside on a plate.
In the same skillet, add the sliced red bell pepper, green bell pepper, and red onion, sautéing for 3 to 4 minutes until they are crisp-tender.
Add the pineapple chunks and return the cooked chicken to the skillet, tossing to combine with the vegetables.
Pour the prepared sauce over the mixture and stir-fry for an additional 1 to 2 minutes until the sauce has thickened and coated the ingredients.
Garnish the dish with sesame seeds and serve immediately.