Preheat oven to 425 °F (218 °C) and line a baking sheet with a silicone baking mat or parchment paper. Set aside.
In a medium bowl, whisk together pumpkin puree, half and half, and egg. Set aside.
1/2 cup canned pumpkin puree, 3 tablespoon half and half, 1 egg
In the bowl of a food processor, combine flour, sugar, baking powder, and pumpkin pie spice. Pulse a few times to combine.
2 cups all purpose flour, 7 tablespoon granulated sugar, 1 tablespoon baking powder, 1 tablespoon pumpkin pie spice
Add the cold butter through the feed tube and pulse until well incorporated and mixture resembles cornmeal.
6 tablespoon unsalted butter
Add the pumpkin mixture to the food processor and pulse until just combined.
Turn the dough onto a lightly floured work surface and gently knead 4 to 5 times to bring the dough together. If the dough seems too sticky, add some more flour to it and knead it together.
Flatten the dough into a 1" thick circle then cut the dough in half then cut the halves into thirds.
Place the wedges on the prepared baking sheet and bake for 14-16 minutes, or just until they're starting to turn golden brown.
Remove from oven and place on a wire rack to cool completely.
In the meantime, make the spiced icing drizzle by combining all the ingredients in a bowl and mixing until combined.
1 cup + 3 tbsp. powdered sugar, 3 tablespoon half and half, 1/4 teaspoon pumpkin pie spice
Once the scones have cooled, drizzle the spiced icing on top and let harden for 10 minutes before serving.