Assemble the packet

Line a 15x10x1-in. baking pan with heavy-duty foil and grease lightly. Place the salmon skin-side down on the foil. Sprinkle with lemon-pepper seasoning and onion salt, top with the onion and lemon slices, and dot with butter. Fold the foil around the salmon and seal tightly.

1 salmon fillet1 to 1 1/2 tsp lemon-pepper seasoning1 tsp onion salt1 small onion6 lemon slices1/4 cup butter