Chop one medium- to large- sized onion. In a large saucepan or soup pot, saute onion in a little butter, until it is translucent and slightly softened. While the onion cooks, chop two large potatoes. I don't even peel them. Add potatoes to onion, and pour in enough milk to cover. Salt to taste -- moderately to liberally. I find it needs more salt than I usually use in my cooking. Simmer until potatoes are tender, or to the texture you like. I let mine go until they are still chunky, but start to break down slightly, thickening the broth. My mom likes them a bit more firm. Add pepper to taste, and serve! 

When I made this for my parents last week, I caramelized the onions before adding the potatoes. I seasoned it with Jane's Crazy Mixed-Up Salt, Mixed-Up Pepper, and some ground dried sage. Yummy. But this is the "recipe" in its simplest form. There's absolutely nothing wrong with it this way! Of course, ingredients can be scaled to make as much or as little as you like. And you can go crazy with seasonings. Next time, I think I'll throw in a can of Niblets. And more onion.