Slice the chicken breast into even 1-inch thick strips to ensure uniform cooking.
In a shallow bowl, whisk together the buttermilk, sea salt, black pepper, garlic powder, onion powder, and smoked paprika.
Submerge the chicken strips in the buttermilk mixture and let marinate for at least 30 minutes in the refrigerator.
In a separate bowl, combine the almond flour and arrowroot powder to create the breading.
Remove each chicken strip from the buttermilk, allowing excess to drip off, then dredge thoroughly in the flour mixture until coated.
Lightly coat the air fryer basket with avocado oil and place the chicken strips in a single layer without crowding the basket.
Air fry at 375°F for 12-15 minutes, flipping halfway through, until the coating is golden brown and the internal temperature reaches 165°F.
Serve the crispy chicken immediately alongside a warm, toasted whole wheat biscuit.