Preheat oven to 250°F. Line a baking sheet with parchment paper.
Thinly slice the oranges. Blot the orange slices with paper towels to remove moisture.
4 Oranges
Place the slices in a single layer on top of the parchment paper and bake in the preheated oven for about 3 hours, checking hourly, or until dry. Reduce the oven temperature as needed to prevent burning.
Notes
Storage: Store dried orange slices in an airtight container. They are edible for up to 2 years and are great for decorations for as long as you want!