Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully coated. Marinate in the refrigerator for at least 30 minutes.
In a separate small bowl, whisk together the almond flour, arrowroot powder, smoked paprika, garlic powder, sea salt, and black pepper.
Preheat your air fryer to 375°F (190°C).
Remove the chicken from the buttermilk, letting any excess drip off, then dredge it thoroughly in the seasoned flour mixture, pressing to adhere.
Lightly brush or spray the coated chicken with avocado oil to ensure a golden, crispy finish.
Place the chicken in the air fryer basket and cook for 12-15 minutes, flipping halfway through, until the internal temperature reaches 165°F.
While the chicken cooks, steam the broccoli florets over boiling water for 4-5 minutes until tender-crisp and bright green.
Serve the crispy chicken immediately alongside the steamed broccoli.