You can try it, but brown sugar has a different flavor and moisture so it will change the texture of the cookies and may change how they bake. Good luck!

Hi Linda! Great question. Would your fresh pumpkin be the same consistency as pumpkin puree from the can? If so, I would just make sure the weight is equal. A can of pumpkin puree weighs 15 ounces, but the recipe calls for 1 cup so you'd use 8 ounces for this recipe. If you fresh pumpkin has more liquid in it than puree from the can, cook it over the stovetop for a few minutes to let some of the liquid evaporate out. The consistency should be thick but loose enough that it will splatter. Does that help? Let me know how they turn out!!