Cook the potatoes in salted, boiling water for 20 minutes until tender

Drain, peel and thinly slice

Preheat the oven to 425 ºF

Brush a cookie sheet with oil or line with baking parchment

Roll out dough on a lightly floured surface, then press out on the cookie sheet

Arrange the slices of potatoes on top and drizzle with oil

Bake for 15 minutes, then sprinkle with the pancetta, cheeses and rosemary and season with salt and pepper

Drizzle with oil and bake for 7-8 minutes more, serve hot