These pumpkin oatmeal cookies can be made with canned or fresh pumpkin puree, as long as the puree is thick. You don't want any liquid in the puree or the pumpkin oatmeal cookies can become sticky rather than chewy. I went with a canned organic pumpkin puree. If you have homemade puree, you can use that. Or if you're interested in making your own, this how-to-make pumpkin purée video is super helpful.