Figuring out how to dry orange slices in the oven can seem daunting. You have to consider the temperature, time, how thin to cut the slices, etc...and the last thing you want to have to do is restart from a failed batch!
Set up your baking sheet with parchment paper lining the bottom.
Lay your orange on its side (if you but the other direction, it will be a juicy mess!) Cut Your orange slices thin (but not too thin that they burn!)
Lay your slices out across the parchment paper lined baking sheet in a single layer.
Blot your oranges on both sides with a dry tea towel or paper towel.
Pop them in the oven for 4-6 hours (or until dry!) Flip about halfway through to ensure even drying.
Pull them out and carefully transfer all the slices to a drying rack. Allow them to sit out to dry overnight. This will help remove any excess moisture still lingering around if there is any.
Notes
Slice your orange into thin circles but not so thin that they will crisp up. On the flip side, if they are too thick, they will take a long time to dry and may even burn!
Store in an airtight container or plastic zip bag until you are ready to craft with them!