heating elements 5 6 7 which are indicated by chain dotted lines in fig1 in fig1 the heating elements 5 6 are two hotplate heating elements of different size arranged at a distance from each other whereas the heating elements 7 provided between the two hotplate heating elements 5 6 is a sheet type heating elements the side portions 9 of which almost enclose the hotplate heating elements 5 6 the heating elements 5 6 7 are each associated with switching elements which can be controlled from the control unit 34 as will be described later in the embodiment shown the heating elements 5 6 7 are radiant heating elements which are covered by the glass ceramic plate 8 the glass ceramic plate 8 shown dissembled from the trap door 2 in fig6 has approximately the dimensions of the upper surface of the trapdoor 2 at its rear corners the glass ceramic plate 8 has two recesses 26 on its outer circumference rim which can partially enclose the openings of the holders 40 consequently the l shaped supports 3 are connected with the trap door 2 outside the glass ceramic plate 8 in addition the glass ceramic plate 8 also has mounting holes 22 through which bases 50 described later protrude for mounting a fixing piece 19 of a baking tray arrangement 19 51 according to the enlarged sectional view shown in fig3 the upper surface of the trap door 2 lies opposite the face.