01 - Preheat the oven to 425°F. Line two baking sheets with parchment paper or lightly grease them.
02 - Peel the onions and slice into ½-inch thick rings. Separate the rings and set aside.
03 - Combine the all-purpose flour, salt, black pepper, and smoked paprika in a shallow bowl and mix thoroughly.
04 - In a separate bowl, whisk the eggs with milk until smooth and well blended.
05 - Toss the panko breadcrumbs with olive oil in a third bowl to evenly coat.
06 - Dredge each onion ring in the flour mixture, dip into the egg wash, then coat thoroughly with the oiled panko breadcrumbs, pressing gently to adhere.
07 - Place the coated onion rings in a single layer on the prepared baking sheets.
08 - Bake for 18 to 20 minutes, flipping the rings halfway through, until golden brown and crispy.
09 - Serve hot with a dipping sauce of your choice.