Pumpkin Gingerbread

Combine flour and sugar; cut in margarine with pastry blender until mixture is crumbly.

Stir in pecans.

Press 1 1/4 cups mixture into bottom of ungreased 9-inch square pan; set aside. Combine remaining crumb mixture, buttermilk and next 8 ingredients; beat at low speed with electric mixer until blended. Pour over crumb mixture and bake at 350° for 40 minutes or until a wooden toothpick inserted in center comes out clean.