5. Cookie Slicer [c.1942] I am always delighted to find historic Muggle artifacts, and this Cookie Slicer from the early 20th century does not disappoint. Simply load a roll of cookie dough in the top feeder and use the red slicing device to cut the dough into sections. The knob allows you to adjust the thickness of the cookie. Once cut, the cookies drop onto the collecting tray below the device.