Preheat oven or air fryer to 400 deg f. Spray sheetpan with non-stick spray.
In three bowls, combine cornstarch/garlic powder/paprika/salt/pepper, eggs (beaten with a splash of water), and panko. Bread cod in cornstarch, eggs (shaking off the excess), then panko. Cook for 10 minutes or until golden brown. Serve immediately.