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Slice the onion into rings.
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Add the flour, 1 teaspoon salt, and pepper to a shallow dish and stir with a fork to combine.
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Add the egg and butter milk to a second shallow dish and stir well with a fork until smooth.
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Add the panko, onion powder, garlic powder, paprika, and remaining salt to a third dish and stir to combine.
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Spritz or brush the basket of the air fryer with oil.
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Dip each onion ring first into the flour, then the egg, then the panko, making sure that the onion is fully coated in each.
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Arrange onion rings in a single layer in the air fryer basket. If you have a rack, place the rack in the air fryer to make a second layer of onion rings. Spritz onion rings with oil.
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Air fry at 380 degrees for 10 minutes, flipping halfway through cooking.