Core and chop the apples and place them in a slow cooker. Add cinnamon and water then cover and cook on low for 6 hours. 

Place cooked apples in a blender or food processor or use a hand blender to puree the soft apples until smooth.  Place puree back into slow cooker to cook down even more for 1-2 more hours until nice and thick and spreadable.  

Store in an airtight container in fridge for up to 3 weeks, use in our 2-Ingredient Dough Apple Cinnamon Rugelach.