Preheat your air fryer to 400°F and lightly grease a waffle iron.
In a small bowl, whisk together the oat flour, egg white, almond milk, and baking powder until a smooth batter forms.
Pour the batter into the waffle iron and cook until the waffle is golden brown and firm.
Slice the chicken breast into strips and dip each piece into the buttermilk.
In a separate shallow dish, combine the almond flour, arrowroot powder, garlic powder, onion powder, sea salt, and black pepper.
Dredge the buttermilk-soaked chicken in the flour mixture, pressing firmly to adhere.
Lightly mist the chicken strips with avocado oil and place them in the air fryer basket.
Air-fry the chicken for 12 to 15 minutes, flipping halfway through, until the exterior is crispy and the internal temperature reaches 165°F.
Serve the hot crispy chicken on top of the fresh waffle and finish with a drizzle of maple syrup.