Preheat oven to 325°F. Prepare 9 in. x 13 in. cake pan with

In medium bowl, combine flour, pumpkin spice, cinnamon, ginger, baking powder, baking soda and salt; In large bowl, beat butter and sugar with electric mixer until fluffy. Add eggs, one at a time, beating well after each addition. Add flour mixture to butter mixture alternately with pumpkin and buttermilk, mixing thoroughly after each addition.

Bake 47-50 minutes or until toothpick inserted in middle comes out clean. Cool in pan on cooling grid completely before frosting with cream cheese icing.