Slice the chicken breast into even 1-inch thick strips.
Place chicken in a bowl with the buttermilk and let marinate for at least 15 minutes in the refrigerator.
In a 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, letting the excess liquid drip off, then dredge thoroughly in the flour mixture until well-coated.
Lightly coat the air fryer basket with the olive oil and arrange the chicken strips in a single layer without crowding.
Air fry at 400°F for 12-15 minutes, flipping the strips halfway through, until the coating is golden brown and the chicken is cooked through.
While the chicken is air frying, steam the broccoli florets in a steamer basket over boiling water for 4-5 minutes until vibrant green and tender-crisp.
Serve the crispy chicken strips immediately alongside the steamed broccoli.