Pre-heat the oven to 248 °F.
Wash your apples then very finely slice them horizontally into thin rounds, going straight through the core, and picking out any pips.
Place them on a non-stick baking tray and dust with icing sugar. Place in the oven for 3 hours until completely dry. They will still be pliable until they cool.
After they have been in the oven use a pallet knife and allow them to cool on a wire rack where they will become crispy. Store in an airtight container. These are perfect to serve as a healthy alternative to sweets and crisps as drying them intensifies their natural flavour and sweetness.