Preheat the oven to 240 ° C (convection). Peel the potatoes and cut into 5 - 10 mm thick slices. The slices should be as evenly thick as possible, otherwise the thin ones will burn and the thick ones will not yet be done.
Mix the potato slices with the oil and salt in a bowl. Place everything on a baking sheet lined with baking paper so that the slices do not touch. Put in the oven and cook for 20 minutes, until the slices are nicely browned.
Serve hot with dip or fried vegetables or meat. This is a low-calorie variant of french fries that is also very filling.