Slice the chicken breast into even strips or nuggets to ensure uniform cooking.
Place the chicken in a shallow bowl and pour the buttermilk over it, ensuring every piece is submerged, then marinate for 30 minutes.
In a separate shallow dish, whisk together the almond flour, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove each piece of chicken from the buttermilk, letting the excess drip off, and dredge thoroughly in the almond flour mixture.
Lightly coat the air fryer basket with the avocado oil to prevent sticking.
Arrange the chicken in a single layer in the air fryer and cook at 400°F for 12 to 15 minutes, flipping halfway through, until the coating is shatteringly crisp and the chicken is cooked through.