A pellet-receiving container including an air flow-directing agitator mounted in the bottom thereof and cooperating with a forced inflow of air initially introduced through a heater element preheated to at least approximately 375. degree. Fahrenheit for intimate unencumbered contact of the entire surface area of each pellet with the hot air.
Foodstuff pellets are puffed by radiantly heating the pellets in a chamber to cause a rapid rise in the chamber temperature to a temperature sufficient for puffing, and once this temperature has been reached, a fluidizing flow of air is created and maintained within the chamber to agitate, move and suspend the pellets within the chamber while maintaining the puffing temperature causing uniform puffing of the pellets. After puffing of the pellets, the radiant heating is discontinued while the fluidizing flow of air continues to cool the puffed pellets.