Preheat oven to 400F. Line baking sheet with parchment paper.
In a large bowl, combine flour, sugar, pumpkin pie spice, baking soda, and salt.
Cut in the butter with a fork or pastry cutter. In a small bowl, combine the pumpkin puree, milk, egg, and vanilla. Combine mixtures, until it becomes a soft dough.
Form the dough into a 12'' circle, 1'' thick. Using a knife, cut the dough into 8 equal pieces, like a pizza. Gently peel them apart and place on the baking sheet. Brush the top of the scones with some milk. Bake for 10-12 min.
While it is cooling, begin making the glaze. Combine all the glaze ingredients and it should become a thick paste. If it is too wet, add more powdered sugar, if it is too dry, only add a touch of milk (it goes a long way).
Spoon on the glaze and spread it on top. Allow the glaze to set before serving, or eat right away!