Abstract: A food warming appliance having base and cover structures defining a portable case. A pair of opposed heating panels are mounted, one in each of the structures, and biased toward each other so as to firmly engage food positioned therebetween when the structures are closed. Foods and food trays of a wide variety of sizes, shapes and thicknesses can be positioned between the panels and firmly gripped so as to be warmed through a gentle conductive heat transfer. The heating compartment is well insulated and has the capability of serving as a cold food storage area to keep frozen foods frozen for substantial periods of time. A safety electrical interlock system normally de-energizes the heating panels when the appliance is open. An interlock by-pass plug and cord permit open case operation where the appliance is to be used to keep foods warm during serving.