Preheat oven to 200°F. Line a baking sheet with parchment paper.
Wash apples under clean water and pat dry with a clean towel.
Thinly slice apples into rounds. You do not need to core the apple, but do remove the seeds.
Place apples in a single layer on the lined baking sheet. Sprinkle with cinnamon.
Bake for 1 hour, then flip apples, bake for an additional 1 hour. Remove from the oven and let cool on the counter, the chips will become crisp. Store in an airtight container for up to 3 days and enjoy!