Slice the yellow onion into 1/2-inch thick rings and separate them.
In a medium bowl, whisk together the chickpea flour, all-purpose flour, smoked paprika, garlic powder, sea salt, and black pepper.
Gradually whisk in the cold light beer and the egg whites until a smooth, thick batter forms.
Preheat your air fryer to 375°F and lightly coat the basket with the avocado oil.
Dip each onion ring into the batter, ensuring it is fully coated, and let any excess batter drip off.
Place the rings in the air fryer basket in a single layer, working in batches if necessary to avoid overcrowding.
Air fry for 10 to 12 minutes, flipping halfway through, until the coating is golden and crispy.
In a small bowl, combine the non-fat Greek yogurt and hot sauce to create a high-protein dipping sauce.
Serve the warm onion rings immediately with the spicy yogurt dip.