01 - Separate the thinly sliced onions into individual rings and pat dry thoroughly with paper towels.
02 - In a large bowl, combine all-purpose flour, cornstarch, salt, black pepper, and optional paprika until evenly blended.
03 - Toss onion rings in the flour mixture until fully coated, then shake off any excess flour.
04 - Heat vegetable oil in a deep skillet or saucepan to 350°F (175°C).
05 - Fry the coated onions in batches, stirring occasionally, until golden brown and crisp, approximately 2 to 3 minutes per batch.
06 - Remove the fried onions with a slotted spoon and drain them on paper towels.
07 - Allow the crispy onions to cool slightly before serving or using as a garnish.