I didn't have an apple core or I sliced out a ring around the core, a couple inches deep.
Then I sliced the apple on a mandolin, and punched out the circle I made around the apple core.
Place apple slices directly on mesh, then sprinkle with cinnamon. You might want to line underneath with paper towels so the cinnamon doesn't sprinkle on your counter.
Dehydrate for 4-6 hours or until desired dryness.
Recipe by Healing and Eating at https://www.healingandeating.com/2013/10/raw-flax-flatbread-and-sliced-cinnamon.html