Peel, core, and slice apples. Place slices in slow cooker.
Add apple cider (or water) and brown sugar. Stir in spices to combine well, then cover with lid.
Cook on high for 8-10 hours, or until apples are dark, soft, and reduced down.
Use an immersion blender to blend apple butter to desired consistency.
Ladle into jars, leaving 1/2 inch head space if you plan to freeze jars.
Cool and keep refrigerated (or frozen) when not in use.
Notes
You can use a variety of types of apples to make this slow cooker apple butter. Using more than one type of apples usually results in better flavor, in my opinion.
It does take quite a few apples (about 6 pounds), but know that it cooks down a lot and I typically get 3-4 pint jars of apple butter.
I don't go through the proper canning process with my apple butter, but the apple butter does freeze very well. Just be sure to use freezer-safe jars or containers.
If you don't have allspice on hand, you can substitute pumpkin pie spice or apple pie spice.
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