Determining an insertion plane of a food support

A method (S1-S5) is for determining an insertion plane (Ek) of the food support (G) in a cooking chamber (3) of a cooking appliance (1) by means of a cover-side camera (11), wherein the food support (G) by the camera (11), and detectable marker (M) the method comprising receiving (S1) an image (a) of the cavity (3) when inserted food support (G) by means of the camera (11), a comparing (S3) at least one marker ( M) having part ((Ek M)) of the image (a) with at least one reference (Bk), and determining (S4) the insertion plane (EK) on the basis of comparing (S3) comprises. A cooking appliance (1) with a cooking chamber (3) and a ceiling side (5) into the cooking chamber (3) facing camera (11) equipped, wherein the cooking appliance (1) for performing the method (S1-S5) is arranged. A food support (G) is to be inserted into a cooking appliance (1), wherein the product support (G) on an edge portion (T) of its upper side at least one highlighted in color mark (M). The invention is particularly advantageously applicable to ovens.