Combine the dry ingredients, add the butter and cut in using a pastry cutter, or with the help of two knives, until it resembles coarse sand, set aside. In a separate bowl combine the yolk, the pumpkin and the milk Mix dry and wet ingredients until well combined. Pour dough on a well floured surface and shape into a circle about 1" thick and 8" in diameter. Using a floured knife cut into 12 wedges, place them on a parchment paper lined baking sheet and bake at 400*F for 16-18 minutes. Let cool.