Preheat the oven to 200C/400F (180C/360F fan). Place the clean and dry potatoes on a nonstick baking tray, mix with the olive oil and a good pinch of salt and pepper.
Bake for 30 minutes until golden and crinkled.
When cool enough to handle, cut a cross in the top of each one around half way through and squeeze slightly to form the classic baked potato look.