I have a standard roasting recipe that I use on all veggies and potatoes. If I want "fries" I just cut the potato into strips instead of chunks.
I use a large freezer bag and put my cut taters or veggies in there. Shake like mad with a little oil (I use canola, olive oil, or a mixture of the two - usually 1 tablespoon of oil for a bagful of veggies - usually about 6 servings or more). Then throw in seasonings (whatever I like) and shake again. I like ranch dressing mix powder, but sometimes just throw in whatever. Like the other day, I threw in a satay powdered seasoning packet for an indonesian flavor. Then empty out the bag into a foil lined baking dish (for easy cleanup) and bake at 400 - 450 until soft inside with carmelized edges. MMMM.