Slice the chicken breast into even 1-inch thick strips.
Place the chicken in a bowl and cover with buttermilk, marinating for at least 30 minutes in the refrigerator.
In a shallow dish, whisk together the flour, cornstarch, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, allowing excess to drip off, and dredge thoroughly in the flour mixture, pressing to adhere.
Preheat your air fryer to 400°F and lightly brush or spray the chicken strips with avocado oil.
Arrange the chicken in a single layer in the air fryer basket and cook for 12-15 minutes, flipping halfway through, until the coating is golden and the internal temperature reaches 165°F.
While the chicken cooks, steam the broccoli florets for 5 minutes until tender-crisp and bright green.
Serve the crispy chicken alongside the steamed broccoli for a balanced, clean-eating feast.