Slice and boil potatoes in salted water until done.
Mash with cream, salt, pepper and butter and allow to cool. Once cool, add Horseradish Mustard, eggs and breadcrumbs. Mix well and form into cakes.
Heat vegetable oil in a large skillet over medium heat. When hot, add potato cakes, being sure not to overcrowd the pan. Cook 3-4 minutes per side, or until golden brown and cooked through. If pan seems to be drying out add 1-2 more tablespoons of oil.