Method

1. Preheat oven to 180°C / 350°F / Gas mark 4
2. Peel the sweet potatoes and cut into very thin slices using a potato slicer or a sharp knife
3. Put the sweet potato slices in a bowl and add two tablespoons of vegetable oil
4. Get those little hands to mix the sweet potato slices and vegetable oil
5. Put tin-foil on the bottom of a baking tray and lay the sweet potato slices out on it
6. Roast in oven for 10 to 15 minutes until crispy and then serve