Cut the butter into small pieces and place in the freezer for about 5-10 minutes.
In a large bowl add the flour, baking powder, salt, cinnamon, pumpkin pie spice and brown sugar. Whisk together until combined.
Add the chilled butter to the dry ingredients and using your fingers or a pastry cutter, cut in the butter until small pea-size bits or butter exist.
Add in the pumpkin, milk and vanilla, stirring until no dry ingredients remain and the dough is well combined.
Grab a parchment lined baking tray and turn out the dough forming one large circle (about 8 - 9 inches wide). Slice the dough into 8 slices like a pizza. Arrange the scones on the tray with a few inches between each scone. Place the tray in the freezer or refrigerator for 15-20 minutes to chill.
Preheat the oven to 425°. Place the chilled scones on the center rack of your oven and bake for 15 minutes. Remove from the oven. After the scones have cooled for a few minutes place on cooling rack.
Prepare the PSL glaze by whisking all the ingredients together until completely smooth. Set aside.
Once you are ready to add the glaze, place a piece of parchment paper or foil under the cooling rack to catch any excess glaze. Drizzle the glaze over each scone to desired sugary preference.