Dry-blend ingredients on a Hobart mixer. Extrusion-mix dry blend at 220 F (104 C). Cool with liquid nitrogen and grind at 0 F (-18 C) through a 0.010-in. screen in a hammer mill. Vacuum dry overnight at room temperature and then screen through a 140 or 325 mesh* screen. Note: Electrostatic spray. Bake 20 min at 350 F (177 C). *best appearance