Line the baking sheet with parchment paper. Brush with not too little olive oil. Lay the potatoes in thin slices on the greased paper. Leave some space between the rows. Halve the peeled garlic horizontally and place under the potato slices like the rosemary. Salt, pepper and brush the potato slices with oil again. Bake the potatoes on medium height for 35 minutes at 200 ° C. They should be lightly crispy and lightly browned.