What you need
Cut the red apples into thin slices.
Sprinkle with some cinnamon.
Put the slices on a baking tray covered with a baking sheet.
Bake the apples in the oven at low temperature – about 100° for about 1½ hour
Let the apples cool down.
If you want the apples to be completely dry and brittle, lower the temperature to 80 ° and double the baking time.