In a medium bowl, combine the flour, baking powder, salt, and pumpkin spice. Whisk to blend and set aside. In the bowl of an electric mixer, beat together the butter and sugars on medium-high speed until light and fluffy, 2-3 minutes. Blend in the pumpkin puree. Beat in the egg and vanilla until incorporated. With the mixer on low speed add in the dry ingredients and mix just until incorporated. Cover and chill the dough for at least 1 hour.