A batch of these homemade onion rings can lift up the day. Thanks to the panko breading, they're very crunchy and perfect for dipping in different sauces while watching a game, tailgating, on movie night or having a casual outdoor barbecue.
Pour the frying oil into a deep saucepan or suitable pan for deep frying and place it over low heat. The ideal temperature is 350°F to 375°F (175°C to 190°C).
Cut the onion into ½ to ⅓ inch thick rings and separate them into individual onion rings. Place them on paper towels so they absorb any liquid they might release.
Stir half of the flour, salt and garlic powder in a shallow plate or bowl. If using other spices (like cayenne or chili powder) or dried herbs like thyme, stir them as well.
In another shallow bowl, whisk together the buttermilk, egg, baking powder and remaining flour. The batter should be quite thick, similar to pancakes.
Pour panko into a separate plate.
Make sure the onion rings are dry, and coat them in the flour mixture, shaking off excess.
Transfer the floured rings to the buttermilk batter and coat until each ring is evenly coated, shaking off excess.
Finally, roll the battered rings in the panko, covering them completely.
Fry for 1-2 minutes, focusing on the breading's color. It should be orange, but not brown.
Place the fried onion rings on paper towels to absorb excess oil for a few minutes.
Serve immediately with the sauce of choice.
Notes
Flavor variations: make them spicier by adding cayenne pepper, paprika or chili powder to the flour mixture. Add a dry herb like thyme or oregano.