Place the chicken breast in a shallow bowl with the buttermilk and let marinate for at least 15 minutes.
In a separate dish, whisk together the almond flour, sea salt, black pepper, smoked paprika, garlic powder, and onion powder.
Remove the chicken from the buttermilk, allowing any excess to drip off, then dredge it thoroughly in the almond flour mixture until evenly coated.
Lightly mist the coated chicken with avocado oil and place it in the air fryer basket.
Air fry at 375°F for 12 to 15 minutes, flipping halfway through, until the exterior is golden and the internal temperature reaches 165°F.
While the chicken cooks, toast the whole-grain waffle until it is warm and slightly crisp.
Place the crispy chicken on top of the waffle and finish with a light drizzle of pure maple syrup.