Preparation Steps

• Gather all ingredients.
• Slice onion into ¼-inch-thick rings. Heat oil in a deep-fryer to 365 degrees F (185 degrees C). Place a wire rack over a sheet of aluminum foil.
• Prepare breading station by setting out 3 wide, shallow dishes. Whisk flour, baking powder, and salt together in the first dish. Whisk milk and egg together in the second dish. Place bread crumbs in the third dish.
• Dip each onion ring into the flour mixture, turning several times until fully coated with flour.
• Transfer to the egg mixture and use a fork to turn until coated. Lift onion with the fork and shake gently so excess liquid drips back into the dish.
• Place onion in the bread crumbs and turn several times to coat, scooping crumbs over the ring if necessary.
• Lift again with the fork, tap any excess bread crumbs back into the dish, and place on the wire rack while you prepare the remaining onion rings.
• Deep-fry 3 to 4 onion rings at a time in the preheated oil until golden brown, 2 to 3 minutes. Drain on paper towels while you deep-fry the remaining rings.
• Sprinkle with seasoning salt before serving.