Pat the chicken breast pieces dry with a paper towel to remove excess moisture for maximum crispiness.
In a medium bowl, toss the chicken pieces with arrowroot powder, sea salt, and black pepper until every piece is evenly coated.
Arrange the chicken in the air fryer basket in a single layer, ensuring they are not touching, and spray lightly with avocado oil.
Air fry at 400°F for 12-15 minutes, shaking the basket halfway through, until the exterior is golden brown and crispy.
While the chicken is cooking, combine honey, coconut aminos, toasted sesame oil, minced garlic, grated ginger, and rice vinegar in a small saucepan.
Place the saucepan over medium-low heat and simmer for 3-4 minutes, stirring frequently, until the sauce reduces and becomes a thick, glossy glaze.
Transfer the crispy chicken to a clean bowl and pour the warm glaze over the top, tossing gently to coat every piece.
Garnish with sesame seeds and thinly sliced green onions before serving immediately.