Preheat oven to 350 degrees. Remove plastic film. Place tray on baking sheet on center rack of oven. Cover with foil. Cook 35-40 minutes.
Microwave: Make small holes in film. Cook on high 6-8 minutes. Rotate. Continue cooking on 50% power for 6-8 minutes. Let stand 1-2 minutes after cooking before removing from microwave. Carefully remove tray from microwave and remove film.