Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
Thinly slice your apples, leaving the peel on for extra fiber.
Spread the apple slices in a single layer on the baking sheet.
Sprinkle evenly with ground cinnamon (and nutmeg, if desired).
Bake for 15–20 minutes or until the edges are slightly golden and the apples are tender.
Let them cool slightly and enjoy warm or at room temperature.