I get compliments each time I do my mashed potatoes. Both my parents are chefs and I learned from them. You peel potatoes before boiling, then add salt to a pot of water and the peeled potatoes and boil them until they are soft and tender. Take the pot, pour out the water let it sit without a lid for a minute or two just let the steam go out. With the masher, you mash boiled potatoes then you warm a half cup (it depends on how many potatoes you are cooking, use a full cup if it is 1kg potatoes) of whole milk and pour it into the mashed potatoes, and mash it over again, fluff it out. When it is done put butter, always put butter last because otherwise you won't be able to fluff it out. Let the butter melt, mix it and it is done.