Preheat oven to 350°F and line baking sheets with parchment paper.
In a large bowl, cream together butter and sugar until light and fluffy.
Beat in the pumpkin, molasses, egg, and vanilla until well combined.
In another bowl, whisk together the flour, baking soda, cinnamon, ginger, cloves, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing just until incorporated.
Chill the dough in the refrigerator for 1 hour.
Roll dough into 1-inch balls, then roll each ball in granulated sugar.
Place on baking sheet about 2 inches apart.
Bake for 10-12 minutes or until edges are set and tops crack slightly.
Cool on the pan for 5 minutes before transferring to a wire rack to cool completely.