Season filets on both sides with garlic salt and Old Bay seasoning.
Brush softened butter on to both sides of seasoned filets.
Heat a large dry skillet over medium heat.
Add filets to hot skillet. Cook for 3-4 minutes then turn over and cook an additional 3-4 minutes on the other side.
Remove from skillet and serve.
Notes
If buying bagged frozen Orange Roughy filets, be aware that the filets can be thinner and sometimes broken up. If you are able to get filets from a fish market or the meat counter, they are usually thicker and more uniform. We used the frozen bagged filets for this recipe.
This fish is best served right away, but if you happen to have leftovers, you can store them in an air-tight container kept in the refrigerator for 1-2 days. Reheat in the microwave.