Slice the chicken breast into even strips and place them in a bowl with the buttermilk to marinate for 20 minutes.
In a separate shallow dish, whisk together the almond flour, arrowroot powder, sea salt, black pepper, garlic powder, and paprika.
Remove each chicken strip from the buttermilk, letting the excess drip off, and dredge thoroughly in the almond flour mixture, pressing to ensure a thick coating.
Preheat your air fryer to 400°F and lightly grease the basket with half of the avocado oil.
Place the chicken strips in the basket in a single layer, drizzle or spray the remaining avocado oil over the top, and air fry for 12 to 15 minutes until golden and crispy.
While the chicken cooks, steam the green beans for 5 to 7 minutes until they are bright green and tender-crisp, then serve immediately alongside the chicken.