Scoop out the seeds and arrange the pumpkin wedges inside the slow cooker.
Cover with the lid and cook on Low for 4 to 6 hours or until the flesh of the pumpkin is very tender.
Scoop the flesh off the skin and transfer the flesh to a food processor or blender. Discard the skins.
Blend the pumpkin until smooth or to a desired consistency.
Spoon the pureed pumpkin into Ziploc freezer bags or wide-mouth canning jars.
Pumpkin puree can be frozen for 3 months or refrigerated for 8 to 10 days.
Notes
Oven Method: Use a large spoon to scrape the seeds from the pumpkin and roast them. Or discard. Place the pumpkin halves, cut side down, on a baking sheet and bake them at 375˚F for 35 to 45 minutes or until tender when pierced with a fork.