Preheat your air fryer to 400°F (200°C).
Slice the chicken breast into even 1-inch thick strips and place them in a small bowl with the buttermilk to soak for 10 minutes.
In a separate shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, allowing excess to drip off, then dredge thoroughly in the flour mixture, pressing firmly so the coating adheres.
Place the coated chicken strips and the broccoli florets into the air fryer basket in a single layer, ensuring they are not crowded.
Lightly mist or brush the chicken and broccoli with the avocado oil to ensure a crispy texture.
Air fry for 12-15 minutes, flipping the chicken and tossing the broccoli halfway through, until the chicken is golden brown and reaches an internal temperature of 165°F.