Step 1: Prepare the Onions - Start by peeling the onions and slicing them into 1/4-inch thick rings. Gently separate the rings and set them aside.
Step 2: Create the Batter - In a large mixing bowl, whisk together the flour, baking powder, onion powder, paprika, garlic powder, and salt.
Step 3: Mix the Wet Ingredients - In another bowl, beat the eggs and mix in the milk until well combined.
Step 4: Combine the Breading - In a separate bowl, combine the panko breadcrumbs with 1/4 teaspoon of salt.
Step 5: Coat the Onion Rings - Dip each onion ring first into the flour mixture, then into the egg mixture, and finally coat it with the panko breadcrumbs.
Step 6: Heat the Oil - In a large pot or deep fryer, heat about 5 cups of oil to 350°F (175°C).
Step 7: Fry the Onion Rings - Fry the onion rings in batches for about 2-3 minutes on each side or until golden brown.
Step 8: Serve and Enjoy! - Once all your onion rings are fried, serve them hot with your favorite dipping sauce.