Slice the chicken breast into even 1-inch thick strips to ensure uniform cooking.
Place the chicken strips in a shallow bowl and pour the buttermilk over them, letting them marinate for at least 15 minutes.
In a separate wide dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, allowing excess to drip off, and dredge thoroughly in the flour mixture until fully coated.
Lightly grease the air fryer basket with avocado oil and arrange the chicken in a single layer, ensuring they do not touch.
Air fry at 400°F for 12-15 minutes, flipping halfway through, until the coating is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, steam the fresh green beans for 5-7 minutes until tender-crisp and bright green.
Serve the crispy chicken immediately alongside the steamed green beans for a balanced, clean-eating feast.