Slice the chicken breast into thick strips and place them in a bowl with the buttermilk to marinate for at least 30 minutes.
In a shallow dish, whisk together the whole wheat flour, garlic powder, onion powder, paprika, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, letting the excess drip off, then dredge thoroughly in the seasoned flour mixture.
Lightly coat the breaded chicken strips with avocado oil using a kitchen sprayer.
Place the chicken in the air fryer basket in a single layer and cook at 400°F for 10 to 12 minutes, flipping halfway through, until the exterior is golden and crispy.
While the chicken finishes, toast the whole grain waffle until it is warm and crisp.
Plate the toasted waffle, top it with the crispy chicken strips, and finish with a drizzle of pure maple syrup.