Preheat the oven to 425° and line a rimmed baking sheet with parchment paper or aluminum foil.
Set three wide and shallow bowls in front of you. Mix flour with salt, garlic powder, and grated Parmesan cheese in first bowl. Whisk eggs with salt and pepper in another bowl. Mix Panko bread crumbs, grated Parmesan cheese, parsley, garlic powder, and salt in a third bowl.
Coat each piece of fish in flour first, then in egg, and last in the Panko mixture. Pat the coating onto the fish firmly and lay in on the prepared baking sheet.
Bake for 18-22 minutes, depending on the thickness of the fish.