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Preheat oven to 400°F (200°C).
In a nonstick skillet, melt butter over medium heat. Add panko breadcrumbs and brown lightly, about 2 minutes. Remove from heat and add chopped parsley, cayenne pepper, garlic powder, salt, pepper, and Parmesan.
Place flour, beaten egg, and panko breadcrumbs into 3 separate shallow dishes.
Dip each fillet first in the flour, then the egg, and finally the panko.
Place fillets on a parchment paper–lined baking sheet. Bake 15–20 minutes or until fillets are golden brown and cooked through.