Device for reheating by microwaves

Device for reheating baked microwaveable food products comprising: i) an external container composed of a lower part and a removable lid fitting to the lower part, all being made of a heat resistant mineral composition that is transparent for microwaves; ii) a sheet susceptible to microwave heating, which sheet is positioned above the bottom of container and spaced from the bottom by supports creating a heat insulating interspace between the bottom and the sheet; iii) in the top of the device just below lid but separated therefrom a sheet susceptible to microwave heating; iv) in sheet opening for microwave heating.