Add the potatoes to a large pot of cold water. Season with salt and bring to a boil. Simmer
until tender, about 15 minutes.
Heat the olive oil in a large pot. Add the onions and saute until tender and just golden. Add the milk to heat and season with salt and pepper.
the potatoes well in a colander
. Add them back to the pot you cooked them in and mash
until smooth. Fold in the hot milk and onions
, extra-virgin olive oil
and chopped parsley.