Preheat oven to 392ºF.
Slice potatoes into wedges and toss in oil.
Mix together rosemary, Parmigiano Reggiano a good pinch of black pepper and add to the potatoes, mixing to give a good coating.
Roast in the oven for 40-50 minutes or until cooked through and golden brown.
Serve sprinkled with more Parmigiano Reggiano and rosemary.