01 -
Place the peeled, cored, and chopped apples into a large slow cooker.
02 -
Add granulated sugar, brown sugar, ground cinnamon, salt, and any optional spices to the apples. Stir thoroughly to coat the apples evenly.
03 -
Cover the slow cooker and cook on LOW for 10 to 12 hours, stirring occasionally, until the apples are soft and deeply browned.
04 -
Use an immersion blender directly in the slow cooker, or carefully transfer the mixture in batches to a standard blender. Puree until completely smooth.
05 -
Stir in vanilla extract and any optional finishing ingredients such as maple syrup. Cook uncovered on LOW for an additional 1 to 2 hours for a thicker consistency, if desired.
06 -
Let the apple butter cool, then transfer to sterile jars. Store in the refrigerator for up to 3 weeks or freeze for up to 6 months.