Peel potatoes and quarter. Drop into boiling, salted water and boil for 20-30 minutes until they're very soft when pricked by a fork.

Drain. Place potatoes back in pot they boiled in and add 1/2 stick (4 tablespoons) of butter or margarine.

Mash slightly with potato masher (or large spoon). With electric mixer, beat on low until all lumps are out.

Add just a little milk, not too runny! Taste potatoes and add salt if needed.