1. **Preheat Oven**: Preheat your oven to 225°F (110°C).
2. **Prepare Apples**: Wash and core the apples. Using a mandoline or sharp knife, slice them very thinly (about 1/8 inch thick).
3. **Prevent Browning**: Toss the apple slices in a bowl with a little lemon juice to prevent browning.
4. **Season**: In a small bowl, mix cinnamon and sugar (if using). Sprinkle this mixture over the apple slices and toss to coat evenly.
5. **Arrange on Baking Sheet**: Lay the apple slices in a single layer on a baking sheet lined with parchment paper, ensuring they don’t overlap.
6. **Bake**: Bake in the preheated oven for about 1.5 to 2 hours, flipping the slices halfway through. They should be dry and crispy when done.
7. **Cool and Store**: Let the chips cool completely on the baking sheet. Once cooled, they’ll become even crispier. Store in an airtight container.
These baked apple chips make for a healthy, sweet snack that you can enjoy any time of the day!
