Preheat your oven to 375 degrees.
In a mixing bowl, combine all of the dry ingredients.
Cut the cold butter into pieces and drop it into the flour mixture.
Cut the butter in with a pastry cutter until the mixture is pea sized .
In a separate bowl, combine the sugars, pumpkin, egg and half and half.
Mix together until just combined.
Pour the wet ingredients into the dry ingredients and mix until combined.
Turn it out onto a clean surface and knead until just smooth.
Pat the dough into a circle that is 3/4 inch thick.
Cut the dough into 6 triangles.
Place the scones on a baking sheet lined with parchment paper or a silpat.
Bake for 12 - 14 minutes. Let cool.