Preheat oven to 225 degrees.
Wash apples thoroughly.
Core apples, then slice very thin. I used my food my food processor.
Lay apple slices flat on greased cookie sheet.
Sprinkle with cinnamon.
Bake for one hour.
Turn over, sprinkle cinnamon on the other side and bake for another hour.
Allow to cool for 20-25 minutes, they will crisp up as they cool.