In a small bowl, whisk together the Greek yogurt and lemon juice to create a clean buttermilk substitute.
Place the chicken breast in the yogurt mixture and let it marinate for at least 15 minutes to tenderize the meat.
In a shallow dish, combine the almond flour, arrowroot powder, smoked paprika, garlic powder, sea salt, and black pepper.
Remove the chicken from the marinade, letting the excess drip off, then dredge thoroughly in the flour mixture until fully coated.
Lightly spray the breaded chicken with avocado oil and place in the air fryer at 375°F for 12-15 minutes, flipping halfway through, until golden and crispy.
While the chicken is air-frying, whisk together the oat flour, egg white, almond milk, and baking powder in a medium bowl until a smooth batter forms.
Pour the batter into a preheated waffle iron and cook according to the manufacturer's instructions until the waffle is firm and slightly browned.
Place the crispy chicken breast on top of the warm waffle and finish with a drizzle of pure maple syrup.