2Trim the ends from the potatoes and thinly slice them into rounds (approx 3mm/1/8").
3Add the sliced potatoes to a large mixing bowl with melted butter, Cajun seasoning, smoked paprika, garlic powder, salt, pepper and 30g of parmesan. Toss until evenly coated.
4Lightly spray a 26cm/10" oven-safe pan with oil and layer the potatoes in a circle around the outside, overlapping as needed. Make a smaller circle to fill the center.
5Cover with foil and bake for 40 minutes.
6Remove foil, increase oven temperature to 200C/400F, sprinkle the remaining parmesan, and bake again for 15 minutes, or until the potatoes are crisp and tender.