Place the chicken breast in a shallow bowl and pour the buttermilk over it, allowing it to marinate for 15 minutes.
In a separate shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing any excess to drip off, and dredge it thoroughly in the flour mixture until evenly coated.
Lightly coat the air fryer basket with avocado oil and place the chicken inside, cooking at 375°F for 12-15 minutes until golden and the internal temperature reaches 165°F.
While the chicken is cooking, steam the green beans in a small amount of water until they are tender-crisp.
In a small ramekin, whisk together the Dijon mustard and honey until smooth to create the dipping sauce.
Serve the crispy chicken alongside the steamed green beans and drizzle with the honey mustard sauce.