Canned pumpkin puree, or 100% pure pumpkin, only contains cooked and mashed pumpkin whereas pumpkin pie filling contains cooked and mashed pumpkin with added flavors, spices, and sometimes added sugars. Using 100% pumpkin allows you to customize your dishes with the spices and flavors you want. Since we are using a spice cake mix already that has a great spice-profile and enough sweetness, 100% pure pumpkin puree should be used in this recipe.