I really only make them for special occasions, so mine are pretty deadly.
I only buy Yukon Gold spuds - they make the best mashed ever.
I peel and boil a five pound bag - cut them in large chunks
Cover with cold water
Add about 6-8 cloves of peeled garlic to the water - no need to chop it up
Cook till a fork goes in very easily, but not till they fall apart or they are too watery tasting (I've only noticed this with the Yukon Golds)
Drain, but reserve about one cup of the cooking water
With a hand mixer, whip them up, along with the garlic. They will be dry at first.
I like lumps in mine, so if you prefer that then use a hand masher. But for company I will whip them.
Add one whole stick of softened unsalted butter
One cup of sour cream
Whole milk and the cooking water -
only as needed to get the correct consistency
Add salt and fresh cracked pepper to taste.
AMAZING!!!!
~Liza