Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully coated. Marinate for at least 15 minutes.
In a separate wide dish, whisk together the almond flour, arrowroot powder, garlic powder, paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting any excess drip off, then dredge it thoroughly in the flour mixture, pressing down to ensure the coating adheres.
Preheat your air fryer to 400°F. Lightly mist the chicken on both sides with the avocado oil.
Place the chicken in the air fryer basket and cook for 12-15 minutes, flipping halfway through, until the internal temperature reaches 165°F and the outside is golden brown.
While the chicken cooks, steam or lightly roast the broccoli florets until tender-crisp and bright green.
Serve the crispy chicken immediately alongside the broccoli for a clean, high-protein meal.