Slice the sweet onion into 1/2-inch thick rings and cut the chicken breast into thin, even strips.
In a medium-sized bowl, whisk together the flour, garlic powder, smoked paprika, sea salt, and black pepper.
Slowly whisk in the light beer and the egg white until a smooth, thick batter forms that can coat the back of a spoon.
Preheat your air fryer to 375°F and lightly coat the basket with the avocado oil spray.
Dip each onion ring and chicken strip into the batter, allowing the excess to drip off, and place them in a single layer in the air fryer basket.
Air fry for 10-12 minutes, flipping halfway through, until the coating is golden brown and the chicken is thoroughly cooked.
In a small bowl, stir the Greek yogurt with a pinch of extra paprika and salt to create a creamy, high-protein dipping sauce.
Serve the hot, crispy onion rings and chicken strips immediately with the yogurt sauce on the side.