The invention relates to a method for preparing a packaged potato millefeuille and potato millefeuille produced, the method comprising cutting potatoes into slices that are between 1 and 2 mm thick, stacking said slices in alternate superimposed layers in a mold (20) with side walls (22, 23) having an inner height measuring between 2 and 3 cm, thermally treating the millefeuille and then cooling and packaging same. The method also includes a preserving step that includes vacuum-packaging the mold (20) with the potato millefeuille in a plastic film packaging (25) before thermal treatment, and subjecting said vacuum-packaged millefeuille to said thermal treatment which causes the pasteurization thereof.
