Preheat your air fryer to 375°F.
Slice the chicken breast into thin strips and the yellow onion into thick, half-inch rings.
In a medium mixing bowl, whisk together the flour, cold light beer, garlic powder, sea salt, and black pepper until a smooth batter forms.
Pat the chicken strips and onion rings thoroughly dry with paper towels to ensure the batter adheres properly.
Dip each chicken strip and onion ring into the batter, allowing any excess to drip off before placing them in a single layer in the air fryer basket.
Lightly brush or spray the battered pieces with avocado oil to help them crisp up.
Air fry for 12 to 15 minutes, flipping halfway through, until the coating is golden brown and the chicken is fully cooked.
While the rings cook, stir together the Greek yogurt, sriracha, and smoked paprika in a small bowl to create the zesty dipping sauce.
Serve the hot, crispy onion rings and chicken strips immediately with the chilled zesty dip.