Slice the sweet onion into half-inch thick rings and separate them into individual pieces.
Season the chicken breast strips with a portion of the sea salt and black pepper, then grill or pan-sear until cooked through.
In a medium bowl, whisk together the chickpea flour, garlic powder, smoked paprika, remaining sea salt, and remaining black pepper.
Gradually stir in the light beer and egg whites until a smooth, thick batter forms that easily coats a spoon.
Lightly coat the air fryer basket with the avocado oil to prevent sticking.
Dip each onion ring into the batter, letting the excess drip off, and place them in a single layer in the air fryer basket.
Air fry at 375°F for 10-12 minutes, flipping halfway through, until the coating is golden and crispy.
Serve the hot onion rings immediately alongside the grilled chicken strips for a complete, protein-packed meal.