Creamy mashed potatoes are easier to make than you think. The trick to smooth mashed potatoes is using high starch potatoes like russets or Yukon golds. They will give you the fluffiest and smoothest mash and also absorb flavorings easily. Also, be sure to use a potato ricer which will give you perfectly smooth potatoes every time. Once the potatoes are riced, you add hot milk, butter and salt and pepper to taste.
If you are serving to a large crowd you can serve some of the potatoes and keep the rest warm in a crock pot.