Preheat oven to 400 degrees.
Add the flour, brown sugar, pumpkin spice, baking powder, baking soda, and salt to a large mixing bowl and whisk to combine.
2 ¼ cups flour, ¼ cup brown sugar, 1 tablespoon pumpkin pie spice, 2 teaspoons baking powder, ¼ teaspoon baking soda, ¼ teaspoon salt
Add the cold butter to the bowl and use a pastry cutter to cut the mixture together until you have coarse crumbs. ½ cup cold butter
In a small bowl, whisk together the pumpkin, milk, and egg. Stir into the dry ingredients until just moistened.
2/3 cup canned pumpkin puree, 3 tablespoons milk, 1 large egg
Turn dough out onto a floured surface and knead 5 times, just to bring the dough together.
Shape the dough into a circle about 1 inch thick and cut into 8 wedges.
Place the scones on an ungreased baking sheet and bake for 12 minutes or until golden brown. Let cool for 25 minutes.
To make the glaze, whisk together the 2 cups of powdered sugar and milk until well combined.
2 cups powdered sugar, 3 tablespoons milk
Remove 1/4 cup of the glaze and spoon the rest over the top of the scones.
Add the cinnamon to the reserved glaze along with 2 tablespoons of powder sugar to thicken the glaze.
1/4 teaspoon cinnamon
Drizzle the cinnamon glaze over the top of the scones by letting it drip off a spoon over the scones.
Let glaze set before eating or storing.