Peel the yellow onion and slice into 1/2-inch thick rounds, then separate them into individual rings.
In a medium bowl, whisk together the chickpea flour, garlic powder, smoked paprika, sea salt, and black pepper.
Gradually pour the light beer and egg whites into the flour mixture, whisking until a smooth, thick batter forms.
Preheat your air fryer to 375°F and lightly coat the basket with avocado oil spray.
Dip each onion ring into the batter, letting excess drip off, and place in a single layer in the air fryer basket.
Air fry for 10-12 minutes, flipping halfway through and spraying once more with avocado oil, until the coating is golden and crispy.
While the rings cook, combine the Greek yogurt, lemon juice, and sriracha in a small bowl to create the zesty dipping sauce.
Serve the hot onion rings immediately alongside the chilled protein-rich dip.