01 -
Peel onions and cut into 1/4-inch rings. Separate the rings.
02 -
Mix flour, cornstarch, salt, and pepper in one bowl. Whisk eggs and milk in another. Put panko in a third bowl.
03 -
Dip rings in flour mix, then egg mix, then panko. Press panko on firmly.
04 -
Spray basket and rings with cooking spray. Cook at 350°F for 5 minutes, flip, cook 5 more minutes.
05 -
Stir mayo and ketchup together in a small bowl.
06 -
Sprinkle with parsley if desired. Serve warm with fry dip.