Dice the chicken breast into 1-inch bite-sized pieces and place them in a medium bowl.
Toss the chicken with arrowroot powder, sea salt, and black pepper until every piece is evenly coated.
In a small glass jar or bowl, whisk together the coconut aminos, rice vinegar, honey, grated fresh ginger, and minced garlic to create the stir-fry sauce.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken to the skillet in a single layer and cook for 5-6 minutes, turning occasionally, until the exterior is golden brown and crispy.
Remove the chicken from the pan and set it aside on a plate.
To the same skillet, add the sliced bell peppers and snap peas, sautéing for 3-4 minutes until they are tender-crisp and bright in color.
Stir in the pineapple chunks and return the cooked chicken to the skillet.
Pour the prepared sauce over the mixture and toss constantly for 1-2 minutes until the sauce thickens into a glossy glaze that coats the ingredients.
Remove from heat, drizzle with sesame oil, and garnish with sesame seeds before serving immediately.