Step 1

Preheat oven to 450° degrees. Tear 2 sheets of heavy-duty aluminum foil (approximately 12"x16").

Step 2

Spray each sheet with non-stick cooking spray.

Step 3

In center of each foil sheet place: onion slices, top with frozen cod fillet, lemon slices, seasoning and chunks of butter. Pull up sides of aluminum foil and seal by folding tightly, repeat on each end of packet.

Step 4

Place packets on baking sheet & bake in oven 15 minutes.

Step 5

After removing from oven, very carefully open packets as there will be steam. Serve contents over rice if desired.