Cut the chicken breast into bite-sized cubes and place them in a bowl.
Sprinkle the arrowroot powder, sea salt, and black pepper over the chicken, tossing until every piece is evenly coated.
In a small jar or bowl, whisk together the coconut aminos, rice vinegar, honey, minced fresh ginger, and minced garlic to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken pieces in a single layer and cook for 3-4 minutes per side until golden brown and crispy, then remove from the pan and set aside.
In the same skillet, add the sliced bell peppers and pineapple chunks, sautéing for 3 minutes until the peppers are tender-crisp.
Return the chicken to the pan and pour the sauce over the mixture.
Stir constantly for 1-2 minutes until the sauce thickens and coats the chicken and vegetables in a glossy glaze.
Garnish with sesame seeds and serve immediately.