Mixed together butter and pumpkin. Cream that mixture together with sugars. in a separate bowl whisk the flour, spices, baking soda and powder. Add it to the wet mixture 1/2 at a time. once you mixed it all into a perfect dough, pop it in the freezer for 10 minutes. Preheat oven to 350ºF. Bake cookies for 12 minutes on parchment paper. Once removed from oven sprinkle a bit of sugar on top.