Preheat your air fryer to 375°F (190°C).
Slice the yellow onion into 1/2-inch thick rings and separate them, then cut the chicken breast into thin strips of a similar size.
In a medium bowl, whisk together the chickpea flour, light beer, smoked paprika, garlic powder, sea salt, and black pepper until a smooth, thick batter forms.
Dip each onion ring and chicken strip into the batter, ensuring they are fully coated, and allow any excess batter to drip back into the bowl.
Place the coated onion rings and chicken strips in a single layer in the air fryer basket, ensuring they do not touch.
Lightly spray the tops with avocado oil and air fry for 12 to 15 minutes, flipping halfway through, until the coating is golden brown and crispy.