Soak onion slices in buttermilk for 10–15 minutes.
In a bowl, mix flour, garlic powder, paprika, salt, and pepper.
Dredge onions in the flour mixture, shaking off excess.
Lightly spray air fryer basket with oil. Arrange onions in a single layer.
Air fry at 375°F (190°C) for 8–10 minutes, shaking halfway, until golden and crispy.
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