Mashed Potato Soup

Directions

1. 1
   In a large saucepan or flameproof casserole, melt half the butter over moderate heat.
2. 2
   Add the onion and cook, stirring occasionally, until the onion is golden and starting to brown at the edges, 8 to 10 minutes.
3. 3
   Add the chicken broth, potatoes, and water.
4. 4
   Bring to a boil, reduce the heat to a simmer, and cook, partially covered, until the potatoes are soft, 20 to 25 minutes.
5. 5
   With a potato masher or the back of a large spoon, mash the potatoes just enough to thicken the soup, but leave plenty of chunks intact.
6. 6
   Add the milk and the remaining butter.
7. 7
   Season the soup with salt, pepper, nutmeg, and cayenne.
8. 8
   Serve piping hot, garnished with the minced chives.