An apparatus for automatically making food products in piece form from dough-like substances comprising a housing containing holding means (11) adapted to be affixed to either end of a flexible sealable bag (12) containing the ingredients for the dough-like substance, and a dough preparation station (13) having an upper and a lower slit forming slit openings (86); kneading means for mechanically working the ingredients in said bag, said kneading means including the holding means (11) and slit openings (86), and means for creating relative oscillating movement between the bag and the slit openings so that the ingredients are kneaded into a dough-like substance; and a heat treating station (14) in said housing whereby the kneaded dough-like substance is treated, said slit openings (86) each being defined by two guiding means such as sliding surfaces (87) or rollers (88). At least one of the guiding means (87, 88) of at least the upper slit is moveable relative to the other guiding means in that pair so as to allow gas to escape from the bag at the desired time.
