1. Chop the butter into 1/2-inch cubes and freeze.
2. Line a baking sheet with parchment paper.
3. Whisk flour, brown sugar, baking powder, pumpkin pie spice, and salt.
4. Cut in the cold butter until crumbly and pea-sized.
5. Whisk pumpkin purée and eggs until smooth.
6. Mix wet ingredients into dry until just combined.
7. Knead dough on a floured surface and shape into an 8-inch circle.
8. Cut into 8 triangles and place on the baking sheet.
9. Chill in the freezer for 30 minutes.
10. Preheat oven to 425°F.
11. Brush scones with milk, sprinkle with turbinado sugar.
12. Bake for 17-22 minutes. Cool completely.
13. Whisk powdered sugar, maple syrup, vanilla, and salt for glaze.
14. Drizzle glaze over scones and let set for 10 minutes.