Slice the chicken breast into even strips or medallions to ensure uniform cooking.
Place chicken in a bowl with buttermilk, tossing to coat, and let marinate for at least 15 minutes.
In a shallow dish, whisk together almond flour, arrowroot powder, garlic powder, onion powder, paprika, salt, and pepper.
Remove each piece of chicken from the buttermilk, allowing excess to drip off, then dredge thoroughly in the seasoned flour mixture.
Lightly brush or spray the air fryer basket with avocado oil and preheat to 400°F.
Arrange chicken in a single layer and mist the tops with the remaining avocado oil.
Air fry for 10-12 minutes, flipping halfway through, until the exterior is crispy and the internal temperature reaches 165°F.