Combine parmesan, flour, panko bread crumbs, salt, and pepper in a shallow dish.
In a separate bowl, whisk the egg and milk together.
Slice the fish into big chunks. Dip the fish fillets into the egg mixture, followed by a dunk in the panko mixture.
Preheat a skillet to medium-high heat with a bit of oil. Fry the fish for about 2 1/2 minutes per side or until it turns golden brown. Between each round of frying, remove the loose panko left behind in the oil.