Slice the chicken breast into thin strips and place them in a bowl with the buttermilk to marinate for 15 minutes.
In a shallow dish, whisk together the arrowroot powder, garlic powder, onion powder, paprika, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, letting the excess drip off, and dredge thoroughly in the arrowroot spice mixture.
Lightly coat the air fryer basket with avocado oil and arrange the chicken strips in a single layer.
Air fry at 400°F for 10-12 minutes, flipping halfway through, until the coating is golden and the chicken is cooked through.
Toast the whole grain waffle until it is warm and crisp on the outside.
Place the toasted waffle on a plate, top with the crispy chicken strips, and finish with a drizzle of maple syrup.