The invention relates to a mold (1) for producing a batter-based food that swells under heat, which mold (1) comprises two cooking subassemblies (2, 3) capable of moving between an open position enabling the batter to be deposited and a closed position in which they define a cooking chamber, in which each cooking subassembly (2, 3) includes a cooking plate (4, 5), with the lower cooking plate (4) comprising a peripheral wall that delimits the cooking chamber and extends above the median plane of said chamber. According to the invention, the peripheral wall includes, on a discharge portion (11), a lowering forming an opening enabling an excess of expanding batter to be discharged, in which the discharge portion (11) extends vertically at least to the median plane of the cooking chamber.