An apparatus for cooking food with superheated steam comprising an outer casing comprising a compartment forming a cooking chamber, suitable for containing one or more foods, said cooking chamber being suitable for containing, in use, a fluid comprising said superheated steam; a steam generating device, capable of vaporizing a liquid; a superheating device of said steam associated with said steam generating device, said superheating device being configured to heat said steam up to an operating temperature higher than the boiling temperature of said liquid and to allow said superheated steam to come out towards said cooking chamber; a recirculation means of the exhausted steam present, in use, in said cooking chamber, said recirculation means being communicating with said cooking chamber and being configured to convey said exhausted steam from said cooking chamber to said superheating device, so as to heat said exhausted steam up to said operating temperature and introduce it into said cooking chamber; a control unit comprising an electronic processor and a memory readable by said electronic processor, said memory comprising data relating to the composition of said fluid circulating in said cooking chamber, said data comprising the concentration of oxygen present in said cooking chamber, said control unit being configured to control said steam generating device and said superheating device on the basis of said data of concentration of oxygen; said recirculation means comprise at least one recirculation conduit, configured to convey said exhausted steam from said cooking chamber to said superheating device, characterized in that the apparatus comprises a valve means being associated with said at least one recirculation conduit, said valve means being able to adjust the quantity of exhausted steam to be conveyed into the inlet of said superheating device upon command of said control unit, said control unit being configured to send a control signal to said valve means based on said oxygen concentration measured in said cooking chamber. an outer casing comprising a compartment forming a cooking chamber, suitable for containing one or more foods, said cooking chamber being suitable for containing, in use, a fluid comprising said superheated steam; a steam generating device, capable of vaporizing a liquid; a superheating device of said steam associated with said steam generating device, said superheating device being configured to heat said steam up to an operating temperature higher than the boiling temperature of said liquid and to allow said superheated steam to come out towards said cooking chamber; a recirculation means of the exhausted steam present, in use, in said cooking chamber, said recirculation means being communicating with said cooking chamber and being configured to convey said exhausted steam from said cooking chamber to said superheating device, so as to heat said exhausted steam up to said operating temperature and introduce it into said cooking chamber; a control unit comprising an electronic processor and a memory readable by said electronic processor, said memory comprising data relating to the composition of said fluid circulating in said cooking chamber, said data comprising the concentration of oxygen present in said cooking chamber, said control unit being configured to control said steam generating device and said superheating device on the basis of said data of concentration of oxygen; said recirculation means comprise at least one recirculation conduit, configured to convey said exhausted steam from said cooking chamber to said superheating device, characterized in that the apparatus comprises a valve means being associated with said at least one recirculation conduit, said valve means being able to adjust the quantity of exhausted steam to be conveyed into the inlet of said superheating device upon command of said control unit, said control unit being configured to send a control signal to said valve means based on said oxygen concentration measured in said cooking chamber.