Preheat your air fryer to 375°F (190°C).
Slice the yellow onion into 1/2-inch thick rings and cut the chicken breast into thin strips.
In a shallow bowl, whisk together the whole wheat flour, garlic powder, smoked paprika, sea salt, and black pepper.
Slowly whisk the light beer and egg white into the flour mixture until a smooth, thick batter forms.
Dip each chicken strip and onion ring into the batter, ensuring they are fully coated, and let any excess drip off.
Lightly spray the air fryer basket with avocado oil and place the coated items in a single layer, working in batches if necessary.
Air fry for 10-12 minutes, flipping halfway through, until the coating is golden brown and the chicken is cooked through.
Serve immediately in a basket for a clean-eating take on a classic pub favorite.