French is wild, but it’s actually pretty easy to remember genders for appliances in particular. Generally, the more attractive the appliance, the less questionable its gender. Who could misgender a swamp cooler or a blender?
You're jamming oiled-up bread into a device that has no means to expel unwanted fluids, and its only form of protest being to overcook your buns. What do you think?
Those hot and spicy crumpets you keep packing into its orifices every morning are going to come home to roost nine months later when you have to clean out all the leftover gunk!