Libby’s brand 100% pure pumpkin is definitely my favorite pumpkin puree go to. Libby's really is concentrated pumpkin with no added salt, has good flavor and is packed with little excess water. You can use other brands of pumpkin puree, but you may want to be proactive and remove excess water by blotting with a paper towel if you do.
Excess water will add additional moisture to your cookies and there is a fine line you have to walk when trying to get a nice chewy texture in your cookies.