Yeah, if you just roast them, the outside texture changes. I kinda like that, but a lot of people don't.
You can do the Bobby Flay usual and parboil, like Foster suggests, that works. Or you can just give them a head start in the microwave. Same idea.
I usually cook them in cast iron with some oil and stir every so often. With that method you can cook from raw potato without the chewy outside layer.