Add the 2 cans pumpkin puree, 1 cup light brown sugar, ½ cup apple cider, and 2 teaspoons pumpkin pie spice to a 4 quart slow cooker. Stir until combined.
Cook on low heat for 5 hours or on high heat for 2 1/2 hours. Stir occasionally.
Once done, transfer pumpkin butter to an airtight container such as a mason jar. Store in the fridge until ready to enjoy.
Discard after 2 weeks.
Transfer the pumpkin butter to an airtight container and store in the fridge until ready to enjoy. Discard after 2 weeks.
Notes
Storage: Store in an airtight container in the refrigerator for up to 2 weeks.