Thick, crispy onion rings with a golden, crunchy batter are a classic American side dish everyone craves. This family-favorite pairs perfectly with burgers, steaks, and sandwiches.
Slice the onions into 1/2-inch thick rings and carefully separate them. Pat dry with paper towels to minimize moisture.
Prepare three shallow bowls: one with flour, cornstarch, baking powder, salt, pepper, and paprika whisked together; one with beaten eggs and milk; and one with panko breadcrumbs.
Dredge each onion ring in the flour mixture, then dip into the egg-milk mixture, ensuring it is fully coated. Let excess drip off.
Press the onion ring into the panko breadcrumbs, making sure each side is fully covered for maximum crunch.
Heat vegetable oil in a deep fryer or heavy-bottomed pot to 360°F (182°C). Fry onion rings in batches for 2-3 minutes per side, turning once, until golden brown and evenly crisp.
Remove onion rings from oil using a slotted spoon and drain on a wire rack or paper towels. Season with a pinch of salt while hot. Serve immediately for peak crispness.