Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and spices (cinnamon, nutmeg, ginger, and cloves).
Add the cold, cubed butter to the flour mixture. Using a pastry cutter or your fingers, mix until the mixture resembles coarse crumbs.
In another bowl, combine the pumpkin puree, heavy cream, egg, and vanilla extract. Whisk until smooth.
Pour the pumpkin mixture into the flour mixture and stir gently until just combined. Be careful not to overmix; the dough should be slightly sticky.
Turn the dough onto a floured surface and gently pat it into a rectangle about 1 inch thick. Cut the dough into triangles or squares using a dough cutter or knife.
Place the scones onto the prepared baking sheet, leaving space between each one. If desired, brush the tops with a little extra cream for a golden crust.
Bake in the preheated oven for 18-22 minutes, or until the scones are lightly golden and a toothpick inserted comes out clean.
While the scones are baking, prepare the glaze by whisking together the powdered sugar and milk until smooth.
Once the scones are done, allow them to cool for a few minutes before drizzling the glaze over the top.