Preheat air fryer to 400°F and a waffle iron to medium-high heat.
Slice the chicken breast into strips and season with sea salt, black pepper, garlic powder, and paprika.
Coat the chicken strips in 1 tablespoon of the Greek yogurt, then lightly dredge in 1 tablespoon of the oat flour.
Place chicken in the air fryer and cook for 12 minutes, flipping halfway, until the exterior is golden and crispy.
In a small bowl, whisk the remaining oat flour, Greek yogurt, egg, and baking powder until a smooth batter forms.
Lightly brush the waffle iron with olive oil and pour in the batter, cooking until the waffle is browned and firm.
Plate the warm waffle and top with the crispy chicken strips.