Slice the chicken breast into thin strips and the yellow onion into thick, uniform rings.
In a small mixing bowl, whisk together the flour, light beer, garlic powder, and smoked paprika until a smooth, thick batter forms.
Dip each onion ring into the beer batter, allowing the excess to drip off, and place them in an air fryer basket lightly coated with avocado oil.
Season the chicken strips evenly with sea salt and black pepper, then arrange them in the air fryer basket alongside the onion rings.
Air fry at 375°F for 12-15 minutes, flipping both the chicken and onion rings halfway through, until the chicken is juicy and the rings are golden-brown.
In a small ramekin, stir together the Greek yogurt, minced chipotle peppers, and lime juice to create the zesty dipping sauce.
Serve the crispy chicken and onion rings immediately while hot with the chipotle aioli on the side.