Peel and cube potatoes, boil until the water becomes starchy. While potatoes are cooking, warm up some milk and butter (S/P) and if you want a ¹/³ to ¹/² block of melterd Velveeta cheese. Take out half of the starchy water and add milk mixture and simmer for a few minutes.
You can add cheese, bacon, chives, or nothing at all... I've made it this way for 30+ years and it's always a big hit and soooo simple. Enjoy...