01 -
Add pumpkin puree, granulated sugar, brown sugar, apple juice, cinnamon, nutmeg, cloves, ginger, and allspice to the slow cooker. Stir to combine.
02 -
Cover and cook on low for 5-6 hours, stirring occasionally, until the mixture is thick and darkened.
03 -
Remove the lid during the last hour of cooking to allow the pumpkin butter to thicken further.
04 -
Cool completely before transferring to airtight containers.