Prepare the oil by heating vegetable oil in a deep fryer or large pot over medium heat until it reaches 350°F (175°C).

Mix the dry ingredients by combining all-purpose flour, garlic powder, paprika, salt, and black pepper in a medium bowl. Whisk until evenly blended.

Prepare the wet mix by pouring buttermilk into a separate bowl.

Coat the onion rings by dipping each ring into the buttermilk, then into the flour mixture, ensuring they are fully covered.

Double-dip for extra crispiness by dipping the coated rings back into buttermilk and then coating with panko breadcrumbs.

Fry the onion rings in batches for 2-3 minutes or until golden brown; turn gently for even browning.

Drain and serve by removing the chips with a slotted spoon and placing them on a plate lined with paper towels.