I adore roasted potatoes, but I do mine differently than the traditional style:
1kg new or baby new potatoes
1-2 tsp thyme
sea salt, cracked pepper to taste
2 teaspoons chopped garlic (love Lazy Garlic, cos, well, I'm lazy)
2 medium onions - red onions also work well
2-4 tablespoons olive oil
I use new potatoes or baby new potatoes, depending upon what's available. Either way, wash and cut potatoes to approximately the same size. If potatoes are small enough, don't bother cutting them.
Mix spices with dried potatoes and garlic in roasting pan and add enough oil to just coat the potatoes and onions. The original recipe for this called for 4 tablespoons -- I use a little over 2.
Roast at 220C/425F for an hour. YUM!