Fill your crockpot with pumpkin puree leaving about an inch from the top.
Add 3 tbsp. of ground cinnamon for larger crockpots - reduce by 1 tbs for smaller pots.
Add 1tsp of allspice for larger crockpots. Reduce by 1/2 for smaller sizes. Add more or less to your personal tastes.
Add of ground cloves. Adjust for crockpot size and taste.
Add 4 cups of sweetener of your choice for larger crockpots. Adjust for size and taste.
Add 2 tbsp. of pumpkin pie spice for larger crockpots. Adjust for your crockpot size. Because I like pumpkin taste, I add 3-4 tbsp.
Set the crockpot on low or medium heat and cover loosely. It will splatter as it boils. I keep my crockpot on a small table all alone.
Do not seal tightly. The steam needs to escape so the butter can reduce in volume and thicken.
Let cook for 6-8 hours.
I do a taste test every 2-3 hours to see if more spice or Splenda is needed.
I also stir occasionally.
Once it is done if you leave it "as-is" you have pumpkin sauce, if you blend it with a food processor or a hand-held drink blender you can create a smoother texture for pumpkin butter.