Peel and core the apples.  Add the apples to the slow cooker and when it begins to fill up, you can use an immersion blender periodically to puree them and create more space.  Don’t worry about finely pureeing the apples.  After the apples are peeled and cored, add the rest of the ingredients to the slow cooker, stir, and leave on the low setting for 6-8 hours.  Puree the apples butter to a smooth consistency.