Wash and dry apples. Remove the core and slice into ⅛ to ¼ inch slices or rings. Peel the apples if desired.
Optional: To prevent apples from browning, soak the slices in a mixture of lemon juice and water for about 5 minutes. Remove and dry thoroughly.
If Using Spices: Mix the maple sugar and cinnamon in a small bowl. Add apple slices to a large bowl and gently toss with the spices. Use as little or as much of the spices as you like.
Arrange sliced apples evenly on dehydrator trays. It's ok if they touch slightly. (If desired, sprinkle on a bit of cinnamon at this time; otherwise, just leave them plain.)
Dehydrate apples at 135 to 145º Fahrenheit for 6 to 12 hours or until the slices snap easily and contain no moisture. Allow them to cool to room temperature, then store in airtight containers.