To the panko add the garlic powder, onion powder, pepper, cayenne pepper, and salt and mix well. One by one, take a ring of onion and evenly coat with flour, followed by egg, and panko breadcrumbs. Lay them flat on the baking sheet and once all are coated place them into the oven. Allow onion rings to bake for 15-25 minutes or until golden brown.Instructions. Heat vegetable oil to 375 F in a large pot or Dutch oven. Sift the flour into a bowl. Then, mix it with salt, black pepper, chili powder, and garlic powder. In another bowl, whisk the milk with the eggs. Dip the onion rings in the milk mixture followed by the flour. Repeat the process three times. Combine with panko in a separate bowl. Preheat oven to 375° and add oil into a cookie sheet with sides. Place cookie sheet into oven to let the oil heat. Bread rings by first placing into flour, then into buttermilk/egg mixture, then into crumb mixture. Set onto a clean platter. Fry, turning once, until golden and crispy, about 1-3 minutes per batch. It really depends on the heat of the oil, h0w wet the batter is and how thick the onions are sliced. Continue with more batches until done. Remove with tongs or a slotted spoon to a paper towel-lined cookie sheet and sprinkle with more salt if needed.
According to a commentator on the blog, the original Sonic onion rings did not have ice cream mixed into the recipe. They wrote, "The menu was a simple menu to prepare, unlike what it is today. The original batter was made with a condensed milk called Milnot and not ice cream mix as earlier stated."
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