Set it to the second thinnest slice.
Make sure you USE THE GUARD.
If you don't have a mandolin, just use a knife and try to slice them as thinly as possible.
Preheat your oven to 200°
Line two cookie sheets and lay out the apples. Make sure none are overlapping, or they could cook unevenly.
Mix together the cinnamon and sweetener and sprinkle evenly on the apple slices. Turn them over to get the back too.
Bake for 1 hour flip the apple and bake for another 1 and 30 minutes.
Turn off the oven and let the chips cool inside the oven for 45 minutes. The extra cool-off time will help the apple crisp up.