In a medium saucepan place potatoes and cover with cold water. Cook until just done, strain.
In kitchen aid mixer put potatoes, butter, sour cream, salt mix and pepper whip slowly to mash.
Add grated cheese and mix thoroughly.
Put in a metal 1/6th hotel pan and keep warm for service.
Cool in shallow pan in walk in.
When cool place in a clean container. Label, date, initial and refrigerate.
To reheat: place in a 2" hotel pan, cover tightly with foil and steam until just heated through.
DO NOT HEAT ON STOVETOP IN PAN.