A shielded cover for a microwave container having upper and lower layers and a diamond-shaped metallic ring therebetween. The ring surrounds an upwardly extending multi-step truncated pyramid formed out of the center section of the upper and lower layers of the cover. The top surface of the truncated pyramid includes a series of openings to vent steam produced within the container. Microwave radiation produced by the microwave oven is reflected by the metallic ring and therefore only penetrates the cover to enter or exit the container at the corners and the center section of the cover. Microwaves are concentrated at the center section of the container and retained within the container, heating the center of the food therein proportionally more than the outer portion of the food, resulting food having a uniform and consistent temperature throughout.