Cook peaches on high for 10 – 12 hours.
When the peaches are soft and mushy, puree them with an immersion blender, or simply mash them very well with a potato masher.
Continue to cook them until you have an applesauce consistency. If you find there’s too much liquid, leave the lid off for approximately ½ hour while it cooks to let some of it evaporate.
Remove from cooker and let cool.