- Grease your baking dish with butter.
- Pop your potatoes in the base and squash down to flatten into a disk.
- Brush with butter and season well with salt and pepper. Bake for 30 minutes at 190°C.
- Bring out and leave to cool almost completely.
- Top with marscapone, mozzarella, salami, onion, rosemary and parmesan.
- Bake for a further 15 minutes.