Heat oven to 400°. Line a baking sheet with parchment paper or a silicone baking-sheet liner.Advertisement
Combine flour, 2/3 cup of the sugar, the baking powder, baking soda, salt and 1/2 teaspoon of the crystallized ginger in a large bowl. Add butter; mix with pastry blender until mixture resembles coarse crumbs. In a small bowl, whisk together pumpkin, buttermilk and egg. Gently stir into dough, along with raisins.
Drop dough by 1/2-cupfuls onto prepared sheet, about 2 inches apart. In a small bowl, stir together remaining tablespoon sugar and remaining 1/2 teaspoon chopped crystallized ginger. Sprinkle sugar-ginger mixture evenly over dough.
Bake at 400° for 16 minutes or until golden brown. Remove to wire rack and let cool slightly. Serve warm or at room temperature.