Slice the yellow onion into half-inch thick rings and set aside.
In a medium bowl, whisk together the flour, light beer, egg white, half of the sea salt, black pepper, and paprika until the batter is smooth.
Preheat your air fryer to 375 degrees Fahrenheit.
Dredge each onion ring into the beer batter, allowing the excess to drip off before placing 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 reach a golden brown color.
While the onions cook, season the chicken breast with olive oil, dried oregano, and the remaining sea salt, then grill over medium heat for 5 to 6 minutes per side.
In a small bowl, combine the nonfat Greek yogurt, sriracha, lemon juice, and garlic powder to create the zesty dip.
Serve the hot, crispy onion rings immediately alongside the sliced grilled chicken and the chilled dipping sauce.