A high protein food may be produced via an extrusion process whereby acid casein is mixed with whey protein, alkali and water. Upon exiting the extruder, the mixture may be cut, dried, and/or tempered, milled and screened before being further processed or packaged. The final product may be configured as a crisp high protein food or a powdered high protein food. The protein content of the end product may be approximately 90-95% on a dry weight basis.