Prepare the hollandaise sauce and keep over warm water in a double boiler until ready to use.
In three separate shallow bowls, place beaten egg, Italian bread crumbs, and flour mixed with the seasoned salt.
Dip fish, one at a time, into the seasoned flour mixture, coating both sides. Follow with a dip in the beaten egg (allow excess egg to run off). Then dip the entire cod loin in the Italian bread crumbs to coat evenly on all sides.
Preheat a large skillet over medium, until pan is hot. Add butter to melt. Gently place breaded cod loins in pan and cook until golden brown, about 3 to 4 minutes per side. Fish should flake easily when done and have an internal temperature of 145° F.
Top with warm hollandaise sauce and serve immediately.