Add the apples to the slow cooker. Add the brown sugar, cinnamon, nutmeg, cloves, and salt.
Stir.
Cover and cook on HIGH for 5 hours or LOW for 8-10 hours.
After the apples have cooked, place them and any liquid that the apples made into a blender, cover with lid, and a towel on top of that (to prevent burns, in case the lid flies off). Hold the lid on while the blender is on. Pulse for about a minute, until very smooth.OR use an immersion blender right in the slow cooker (as shown in the video).
Video
Notes
You can use apple pie spice instead of these individual spices. Use 1 Tablespoon plus one teaspoon of apple pie spice.