Preheat oven to 350°.
In a large bowl, cream butter and sugar until light and fluffy.
Add eggs, one at a time, beating well after each addition.
Add pumpkin. Combine flour, pie spice, baking powder, cinnamon, salt, baking soda and ginger; add to creamed mixture alternately with buttermilk, beating well after each addition.
Pour batter in 8" loaf pan or fill paper-lined muffin cups three-fourths full.
Bake 20-25 minutes or until a toothpick inserted in the center comes out clean.
Cool 10 minutes before removing from pans to wire racks to cool completely.