To begin, 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 blender until there are no pieces larger than a pea.
Mix in the brown sugar, pumpkin, and milk.
Mix in milk and pumpkin until just combined. Stir until just combined.
Turn it out onto a clean surface and knead until just smooth. Pat the dough into a square that is 3/4 inch thick.
Cut the dough into 9 squares and then cut each square in half diagonally.
Place the scones on a baking sheet or stone lined with parchment paper or a silpat.
Bake for 16 minutes.
Meanwhile combine the glaze ingredients in a small sauce pan over medium heat. Bring it to a gentle boil and let it bubble for one minute, stirring occasionally. Turn off the heat.
When the scones are done baking, transfer them to a cooling rack that is over another baking sheet or a sheet of parchment paper to catch drips. Brush the glaze over the hot scones.