Preheat oven to 225° F. Prepare 1 or 2 baking sheets by lining with parchment paper.
Using a mandolin, slice apples very thinly. Core if desired, prior to slicing. Spread the apple slices in a single layer on the prepared baking sheets.
In a small bowl, mix together cinnamon and ginger. Sprinkle the apple slices lightly with cinnamon and ginger mixture.
Bake for one hour, flip apple slices over, and continue to bake for another hour. Turn off oven and let slices cool in the oven for about an hour before removing from the oven.
Notes
Store in an airtight container for up to one week.
Any type of firm apple will work.
Cinnamon and ginger can be omitted, if desired. You can also substitute my apple pie spice.
Recipe can be easily doubled, if you have room in your oven for another sheet pan. Rotate the pans when you flip the apples.