A process for converting spent grain into flour by drying and milling is disclosed. The process includes the steps of introducing a quantity of wet spent grain into a container for removing moisture by the action of gravity. After the gravity drying, the wet spent grain is transferred to a press to mechanically remove additional moisture. The wet spent grain is placed in a fluid bed processor where the grain additional moisture is removed through heating and fluidization. Some embodiments may include a dust collection system in connection with the fluid bed processor, wherein the dust collection system incorporates a separator for separating the grains. Once dried, the dry spent grain is introduced into a mill to be ground into the proper flour consistency. The resulting flour product can then be used for a variety of foodstuff applications.