Heat oven to 220C
Grease a baking tray with about 1 tspn of the oil
Very thinly slice your potatoes ( a mandolin is great for this but it can be done with a sharp knife
Run the slices under cold water
Drain and put them in a bowl
Add the remaining oil and seasoning and toss well to coat
Arrange the slices on the baking trays in overlapping circles. You can make 1 big one or 4 smaller ones
Bake in a hot oven until tender and golden ( about 25-30 minutes )
Serve