to make the surface a non stick surface may include but are not limited to teflon u2122 a k a polytetrafluoroethylene ptfe perfluoroalkoxy pfa fluorinated ethylene propylene fep ethylene tetrafluoroethylene etfe or some combination thereof coatings to affect the color of a surface may include but are not limited to ceramic coatings silicone coats such as but not limited to methyl polysiloxane phenyl polysiloxane or methyl phenyl polysiloxane with or without suitable high temperature stable pigments such as but not limited to zinc oxide white cadmium sulfide yellow orange cobalt blue titanium dioxide white iron oxide red copper salts green or some combination thereof fig3 shows a schematic cross section view the base structure and the heat distributing convention plate of a portable passive convection cooking oven in accordance with a preferred embodiment of the present invention fig3 shows a heat distributing convection plate 250 that is conical in shape one of ordinary skill in the art will readily appreciate that the heat distributing convection plate 250 may have any suitable surface that slopes down from the centrally located apex 310 i e is substantially convex when viewed from above such as but not limited to a portion of a sphere a portion of a rotated conic section or some combination thereof the heat distributing convection plate 250 may be shaped and sized to rest on the substantially flat base 200 such.