Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully submerged. Let it marinate for at least 15 minutes.
In a separate wide dish, whisk together the almond flour, arrowroot powder, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing the excess to drip off, and dredge it thoroughly in the flour mixture, pressing firmly to adhere the coating.
Lightly spray or brush the air fryer basket with avocado oil and place the chicken inside.
Air fry at 400°F for 12-15 minutes, flipping halfway through, until the exterior is golden and the internal temperature reaches 165°F.
While the chicken cooks, whisk together the honey and red pepper flakes in a small microwave-safe bowl and warm slightly for 10 seconds.
Drizzle the spicy honey over the hot, crispy chicken and serve immediately.