In a small bowl, whisk together the buttermilk, garlic powder, paprika, sea salt, and black pepper to create the marinade.
Slice the chicken breast into thick strips, submerge them in the buttermilk mixture, and marinate for at least 20 minutes in the refrigerator.
Preheat your air fryer to 400°F and lightly coat the basket with the avocado oil.
Remove the chicken from the marinade, dredge lightly in one tablespoon of the oat flour, and air fry for 10-12 minutes until the exterior is golden and crispy.
While the chicken is cooking, whisk the egg, Greek yogurt, remaining oat flour, and baking powder in a bowl until a smooth batter forms.
Pour the batter into a preheated waffle iron and cook until the waffle is firm and golden brown.
Place the crispy chicken strips on top of the warm waffle and serve immediately with a drizzle of pure maple syrup.