CCP: Dice potatoes and boil until a minimum internal temperature of 135°F has been reached, then mash with milk, butter, and cream cheese.
In a separate bowl, whip together the mustard with mayonnaise.
Using a #8 scoop, place ½ cup of mashed potato on a greased, heated pan or flat top grill. Flatten with a spatula to ½ inch thick pancakes. Fry mashed potatoes, flipping once, until browned on both sides.