These potatoes can be sprayed with olive oil pan spray rather than using regular oil to make them less fattening. Most any vegetable can be prepared like this. The roasting give them a much more intense flavor than just steaming them.
I've done carrots, parsnips, broccoli and cauliflower this way and my family loves them.
Preheat oven to 425 degrees. Wash hands thoroughly. Scrub potatoes and cut into 1 inch cubes.
Place potatoes in a plastic bag or in a bowl. Add olive oil, salt, pepper and rosemary and toss well to cover potatoes.
Spread potatoes on a baking sheet that's been sprayed with pan spray. Bake in oven for 15-20 minutes or until potatoes are golden brown and are cooked through. Remove from oven, drizzle with a bit more olive oil and season again if needed. Sprinkle with Parmesan cheese before serving.