An ice-cream making machine comprises a first production line and a second production line with an inlet pump, a mixing and chilling chamber, an outlet pump connected in series, as well as a cooling circuit in heat exchange connection with the mixing and chilling chamber, respectively, wherein an auxiliary conduit selectively connects and disconnects the outlet pump of the first production line to/from an inlet of the mixing and chilling chamber of the second production line, so as to be able to process either two flows of confectionery mass mutually independently or a single flow of confectionery mass by means of both production lines.