Go to Amazon, and buy their $65 Nesco dehydrator... you will fall in love with it. I've been having fun making sweet potato and carrot chips, as well as dried bananas, kiwis, pineapples, plantains and apples.
Let's discuss the apples. As you can see in the photo, I used a mix of red and green apples for variety. I removed their cores, and sliced them in the mandolin slicer at 1/16th of an inch. Next, I tossed them with lemon juice and cinnamon. Then I dehydrated them at 104 degrees for about 8 hours.
They end up being crisp but not crunchy... and they are a bit tart, but the cinnamon balances that out nicely. Note that I just used ground cinnamon, not cinnamon sugar. The apples are sweet enough on their own, there is no need to add to that.