Slice the chicken breast into even strips and place them in a bowl with the buttermilk to marinate for at least 20 minutes.
In a shallow dish, whisk together the almond flour, arrowroot starch, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, letting the excess drip off, and dredge thoroughly in the flour mixture, pressing to ensure the coating sticks.
Lightly coat the breaded chicken strips with avocado oil using a kitchen mister or brush.
Arrange the chicken in a single layer in the air fryer basket and cook at 400°F for 12 to 15 minutes, flipping halfway through, until golden and crisp.
While the chicken cooks, steam the broccoli florets until tender-crisp and serve alongside the hot crispy chicken.