Preheat your oven to 375°F and line a baking sheet with parchment paper.
Whisk the flour, sugar, baking powder, salt, and 2 teaspoons of pumpkin pie spice together in a large mixing bowl.
Cut in the cold butter using a pastry blender or two forks until the mixture looks like coarse crumbs.
Stir together the pumpkin puree, 6 tablespoons of cream, beaten egg, and 1 teaspoon of vanilla in a separate bowl.
Add the wet mixture to the dry ingredients, stirring with a fork until a rough dough starts to form. If the dough feels too dry, add another tablespoon of cream.
Transfer the dough to a floured surface and gently knead just until it comes together.
Shape the dough into a 1-inch thick circle and cut it into 12 wedges. Arrange the wedges on the baking sheet and refrigerate for 30 minutes.
Brush the tops with 1 tablespoon of heavy whipping cream and sprinkle with the remaining ½ teaspoon of pumpkin pie spice.
Bake for 25 minutes or until the tops are golden and the scones are baked through. Cool on the baking sheet for 5 minutes, then move to a wire rack to cool completely.
Make the glaze by whisking together the confectioners’ sugar, 6 tablespoons of cream, and the remaining teaspoon of vanilla. Add a little more cream if needed until the glaze is smooth and pourable.
Drizzle the glaze over the cooled scones and let it set for 10 minutes before serving.