Preheat your air fryer to 375°F and lightly spray the basket with avocado oil.
Peel the yellow onion and slice it into half-inch thick rounds, carefully separating them into individual rings.
In a medium bowl, whisk together the all-purpose flour, light beer, half of the sea salt, half of the black pepper, and half of the garlic powder until the batter is smooth.
Dip each onion ring into the beer batter, allowing the excess to drip off, and arrange them in a single layer in the air fryer basket.
Air fry the onion rings for 10 to 12 minutes, flipping halfway through, until they are deeply golden and crispy.
Season the chicken breast with the remaining sea salt, black pepper, and garlic powder, then grill over medium-high heat for 5 to 6 minutes per side until cooked through.
In a small ramekin, stir together the non-fat Greek yogurt, smoked paprika, and lemon juice to create a zesty dipping sauce.
Slice the grilled chicken into strips and serve immediately alongside the hot onion rings and the chilled dipping sauce.