Preheat your oven to 400F and line a baking sheet with parchment paper or a silpat.
Cut the butter into cubes and freeze for 10 mins.
In a large bowl whisk together flour, grandulated sugar, baking powder, baking soda, spices, and salt.
In medium sized bowl wisk together the cream, pumpkin puree, brown sugar, egg, and vanilla until combined.
Add the frozen butter to the dry mixture. Using a pastry cutter or your fingers cut the butter into the flour until it is in pea-sized pieces. Or you can do this in a food processer with a couple of pulses, just be careful not to over mix.
Fold the pumpkin mixture into the flour mixture until just moistened and no large pockets of flour remain.
Turn out the dough onto a well floured surface. Using floured hands, gently work the dough into an 8 x 8 inch square. First cut the square into quarters and then cut each quarter in half diagonally. This should create 8 triangles. Transfer the scones to your prepared baking sheet and freeze for 25 mins.
After the scones have chilled, brush the tops with heavy cream.
Bake for 20-22 minutes. The scones are done when they are golden brown and your house smells of fall. Transfer to a wire rack to cool before glazing.