Slice the chicken breast into thin strips or bite-sized nuggets to ensure even cooking.
In a shallow bowl, whisk the egg white until it becomes slightly frothy.
In a separate shallow bowl, whisk together the almond flour, garlic powder, onion powder, sea salt, and black pepper.
Dip each piece of chicken into the egg white, allowing excess to drip off, then dredge thoroughly in the almond flour mixture.
Lightly grease the air fryer basket with avocado oil and arrange the chicken in a single layer without crowding.
Air fry at 400°F for 10 to 12 minutes, flipping the chicken halfway through, until the coating is golden and the chicken is cooked through.
While the chicken is finishing, toast the whole grain waffle until it is warm and slightly crisp.
Place the crispy chicken pieces on top of the toasted waffle and finish with a light drizzle of maple syrup.