Slice the chicken breast into even strips and place them in a small bowl with the buttermilk to marinate for at least 20 minutes.
In a shallow dish, whisk together the almond flour, arrowroot powder, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, allowing the excess to drip off, and dredge thoroughly in the flour mixture until fully coated.
Lightly coat the air fryer basket with avocado oil and arrange the chicken in a single layer, ensuring they are not touching.
Air fry at 400°F for 10-12 minutes, flipping halfway through, until the coating is golden brown and the internal temperature reaches 165°F.
While the chicken is cooking, steam the broccoli florets for 5 minutes until tender-crisp and serve immediately alongside the hot chicken.