01 -
Set the oven to 190°C (375°F) to preheat.
02 -
Grease a baking dish or line it with aluminum foil to prevent sticking.
03 -
Sprinkle Old Bay seasoning and garlic salt evenly over the rockfish, then place it in the prepared dish.
04 -
Distribute butter and lemon slices on top of the seasoned fish.
05 -
Place the dish in the oven and bake for 20 minutes until the fish is cooked through and flakes easily.