A crispy, kid-friendly snack they can even help make! Preheat oven to 200F. Slice apples very thin, about 1/16 of an inch. Arrange on lined thick-bottomed baking sheet, making sure that none overlap. Bake for 1 hour, flip slices, then bake for one more hour. (I'll probabaly sprinkle some sugar and cinnamon on mine!!). Remove from oven and let cool to crisp. Store in an airtight container.