In a small bowl, whisk together the buttermilk, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Place the chicken breast in a shallow dish, pour the buttermilk mixture over it, and marinate in the refrigerator for at least 30 minutes.
In a separate shallow bowl, combine the almond flour and arrowroot starch to create the breading mixture.
Remove the chicken from the marinade, let the excess drip off, and dredge it thoroughly in the flour mixture until evenly coated.
Lightly spray or brush the chicken with avocado oil and place it in the air fryer basket.
Air fry at 375°F for 12 to 15 minutes, flipping halfway through, until the exterior is golden and the internal temperature reaches 165°F.
While the chicken is cooking, mix the whole wheat flour, Greek yogurt, and baking powder in a small bowl until a soft dough forms.
Drop the dough onto a parchment-lined baking sheet and bake at 400°F for 10 to 12 minutes until the biscuit is puffed and golden brown.
Serve the crispy buttermilk chicken immediately alongside the warm, fresh biscuit.