Preheat your oven to 200 degrees F. Line two baking sheets with parchment paper.
Wash the apples. Cut the tops off and take the sliced end of the apples to a mandolin and thinly slice the apples. With a knife or a fun shaped cookie cutter remove the middle core of the apples slices. I used a mini star one.
Arrange the apples in a single layer on the prepared baking sheets. Sprinkle with cinnamon and sugar (optional). Bake for 1 hour in the upper and lower thirds of the oven. Remove the baking sheets and switch the pans’ position on the upper and lower racks. Continue baking for 1 to 1 1/2 additional hours. The thicker the slices the longer it will take to cook.
Once a chip is crisp when set out at room temperature for 2 to 3 minutes, you’re done! You can turn off the oven and allow them to crisp even further or immediately place them in a sealed glass jar. If moisture gets to them they may soften in texture.