In a small bowl, beat together the butter, white and brown sugar,and pumpkin. Stir in the nutmeg, cloves, and cinnamon.
Add the flour one cup at a time, stirring between each new addition. Stir in the baking powder and salt. Cover the bowl and chill dough for one hour.
Preheat the oven to 350 F. Measure about two tablespoons of dough in the palm of your hand and roll into a ball. Arrange the dough balls on a parchment or silicone lined baking sheet.
Dust the bottom of a glass with flour. Gently press each dough ball flat, until they are about a half inch thick. Pop the baking sheet into the oven and bake for ten minutes, or until golden brown.
While the cookies are baking, use a hand mixer to beat together the melted butter and maple syrup. Slowly add powdered sugar until a thick icing forms. It should be stingy but not clumpy.
Cool the cookie completely. Use the back of a spoon to spread the icing on the top of each cookie. Decorate with fall themed sprinkles. Enjoy!