Slice the chicken breast into even strips and place them in a bowl with the buttermilk to marinate for 15 to 20 minutes.
In a shallow dish, whisk together the arrowroot powder, sea salt, black pepper, garlic powder, and paprika until well combined.
Preheat your air fryer to 400°F and lightly grease the basket with half of the avocado oil.
Remove each chicken strip from the buttermilk, allowing the excess to drip off, then dredge thoroughly in the seasoned arrowroot mixture.
Arrange the chicken in a single layer in the air fryer basket, drizzle with the remaining avocado oil, and cook for 12-15 minutes, flipping halfway through, until crispy and golden.
While the chicken is cooking, steam the broccoli florets in a steamer basket over boiling water for 5 minutes until tender-crisp.
Serve the crispy chicken immediately alongside the steamed broccoli for a clean and satisfying meal.