Combine the dry ingredients. In a bowl add in the All purpose flour, baking powder, onion powder, garlic powder, black pepper, and the cayenne pepper.

Slice the onion 1/2" inch to 1" wide. Separate the rings.

Place a few of the onion rings into the bowl of flour. Cover and shake the bowl.

Take the onion rings out and shake off the excess flour. Then transfer to a plate. Repeat the process until all the onion rings are coated with the flour.

Pour the Panko bread crumbs into a bowl. Set aside.

Now add an egg to the dry mixture and also the milk. Stir the batter until smooth.

Place an onion ring into the batter and coat. Then pick up the onion ring and let the excess batter drip off. Next transfer the onion ring to the bowl of panko crumbs and coat. Place on a plate and repeat the process for the rest of the onion rings.

In a wok add the cooking oil and turn on to Medium High heat. Once the oil is hot add in the onion rings. Do not overcrowd the wok. Fry for about a minute on each side or until browned. Remove from the cooking oil and place on a plate lined with paper towels. As soon as the onion rings come out of the wok immediately season the onion rings. After removing the first batch from the work let the oil come back to temperature before adding in the next batch of onion rings.

Serve with ketchup or your favorite dipping sauce.