Preheat the oven to 225 degrees and grease 2 baking sheets with the olive oil.

Remove the cores from the apples. Slice the apples into uniformly thin rings, then place them in a single layer on the baking sheets. Sprinkle the apple slices with cinnamon.

Bake for 2 to 2½ hours, or until desired level of crispiness is achieved. A shorter cook time will yield chewy apple rings, and a longer time will give you crisp chips. Cool on a wire rack.

Store the apple chips in an airtight container.