In a shallow bowl, whisk together the buttermilk and egg white until well combined.
Submerge the chicken thighs in the buttermilk mixture and marinate for at least 30 minutes in the refrigerator.
In a separate shallow dish, mix the almond flour, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove each chicken thigh from the marinade, let the excess drip off, and dredge in the almond flour mixture, pressing firmly to coat.
Preheat your air fryer to 375°F and lightly coat the basket with half of the avocado oil.
Place the chicken in the basket in a single layer and drizzle or spray the remaining avocado oil over the top.
Air fry for 15-18 minutes, flipping halfway through, until the internal temperature reaches 165°F and the crust is crispy.