Preheat oven to 400 degrees F and place rack in middle of oven. Line a baking sheet with parchment paper or Silpat.In a large bowl, whisk together the flour, sugar, spices, baking powder, baking soda and salt. Cut the butter into small pieces and blend into the flour mixture with a pastry blender or two knives. I use my hands! The mixture should look like coarse crumbs. Stir in the white chocolate.

In a separate bowl mix together the buttermilk, pumpkin puree and vanilla and then add the buttermilk mixture to the flour mixture. Mix just until the dough comes together. Do not over mix the dough.Transfer to a lightly floured surface and knead dough gently four or five times and then pat the dough into a circle that is about 7 inches (18 cm) round and about 11/2 inches (3.75 cm) thick. Cut this circle in half, then cut each half into 3 pie-shaped wedges (triangles) (I cut it into 8 triangles). Place the scones on the baking sheet. Brush the tops of the scones with the cream and sprinkle a little Turbinado sugar on top.Place the baking sheet inside another baking sheet to prevent the bottoms of the scones from over browning. Bake for about 20 minutes or until golden brown and a toothpick inserted in the middle comes out clean. Transfer to a wire rack to cool and drizzle scones with the glaze.