Preheat your air fryer to 375 degrees Fahrenheit.
Slice the sweet onion into half-inch thick rings and carefully separate them.
In a medium mixing bowl, whisk together the whole wheat flour, light beer, egg whites, garlic powder, and smoked paprika until a smooth batter forms.
Dip each onion ring into the beer batter, allowing any excess to drip off, and place them in a single layer in the air fryer basket.
Lightly spritz the onion rings with avocado oil and air fry for 12 to 15 minutes, flipping halfway through, until they are golden and crispy.
While the rings cook, season the chicken breast with sea salt and black pepper, then grill or pan-sear over medium-high heat for 6 to 7 minutes per side until fully cooked.
In a small bowl, stir together the Greek yogurt and lemon juice to create a tangy protein-rich dipping sauce.
Serve the crispy onion rings immediately alongside the grilled chicken and the prepared dipping sauce.