Bake in preheated oven to approximately 250 degrees C for about 45 minutes-1 hour. My oven doesn't show the temperature, so I baked them to a higher heat level, then I checked them with a knife after 30 minutes. If you can push the knife in, then you cook them for about 15 more minutes. If the potatoes are bigger, increase the heat.
Best is to serve them hot, right after you remove from the oven - but they also proved to be extremely good when heated in the microwaves.