Chop and core apples (leaving the skins on or off).
Place chopped apples in a 4-5 quart slow cooker.
Stir in apple cider, sugar, cinnamon, lemon juice and stir.
Cover and cook on low for about 6 hours.
After cooking, apples will just need to be stirred to breakdown the rest of the way. If you left the skins on, you'll need to chop up the skins with an immersion blender or handheld mixer.
Give it a taste test (be careful, mixture will be hot!) and see if you need any more sugar or cinnamon to meet your tastes.
Video
Notes
The only downside with leaving the skins on is they never totally break down while cooking like the rest of the apple does. So, you have to go in there with an immersion blender if you want them totally incorporated.
Or, you can peel the apple before cooking, and you will see that after cooking down for a few hours, all you need is a fork to stir the apples and you immediately have applesauce.
The amount of sugar you use will depend on the tartness of your apples and your tastebuds. This is a VERY forgiving recipe and all the sugar does not have to be added at the beginning of the process. After I made this, I gave it a taste and realized it needed a tad more sugar. So I sprinkled a bit more on the finished product, gave it a stir, gave it another taste and it was perfect. So, if you want, start with a little and add more later if it is needed. The same goes for the cinnamon. Start with a small amount if you are unsure and then sprinkle more in later to get it to a taste you enjoy!