Slice the chicken breast into thick strips and place them in a small bowl with the buttermilk to marinate for 10 minutes.
In a shallow dish, whisk together the arrowroot powder, smoked paprika, garlic powder, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, letting the excess drip off, then dredge thoroughly in the arrowroot mixture until fully coated.
Lightly brush or spray the air fryer basket with avocado oil and place the chicken inside in a single layer.
Air fry at 375°F for 12-15 minutes, flipping halfway through, until the coating is golden brown and the chicken is cooked through.
While the chicken finishes, toast the whole grain waffle until crisp.
Place the toasted waffle on a plate, top with the crispy chicken strips, and drizzle with the maple syrup before serving.