Rinse apples and cut crosswise into thin slices. Cut out the core if desired.
Arrange slices in a single layer on baking sheets. Sprinkle lightly with cinnamon if desired.
Bake at 200 degrees for about 1 hour. Turn slices over. Continue baking until dry with no moisture in the center, 1 hour or more depending on thickness.
Remove from oven and cool. Store in an air-tight container for up to a year. Recipe adapted from Nutrition Matters.
