Place the chicken breast in a small bowl with the buttermilk and let marinate for 15 minutes.
In a shallow dish, whisk together the almond flour, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing excess to drip off, then dredge thoroughly in the almond flour mixture until fully coated.
Lightly spray or brush the chicken with avocado oil and place in the air fryer basket.
Air-fry at 375°F for 12-15 minutes, flipping halfway through, until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, combine the chicken bone broth, almond milk, and arrowroot powder in a small saucepan over medium heat.
Whisk the gravy constantly until it simmers and thickens into a smooth consistency.
Serve the crispy chicken immediately, topped with the warm creamy gravy.