Step 1Preheat the oven to 150 °C/ 300 °F (fan assisted), or 170 °C/ 340 °F (conventional). Line a baking tray with strong parchment paper. Lay the mozzarella cheese slices on the parchment paper, overlapping slightly. Depending on the size of the slices, you should get a rectangle that's about 28 cm (11 inch) x 20 cm (8 inch).
Note: Mozzarella, Gouda, Emmental or Gruyere slices will all work well in this recipe.