Update (10/19/14): I have been making these a lot with yellow potatoes and am loving them this way- they really hold their shape and don't break down as easy. I have also not melted the butter first but thrown it cut up into the pan with the potatoes and other ingredients- just making sure to stir the potatoes in the oven as it melts. This has seemed to work great.
Yields- 4 side dish sized servings, can easily be halved or doubled
They can be cooked at a lower temp if you are cooking other food that requires a lower temp. You just may have to cook longer or you may have to turn up the oven temp at the end to crisp them up a bit. (They are great not crispy too!)