Preheat an oven to 200c (400f) and prepare a baking sheet with parchment paper.
Cut the butter into small cubes and store in the fridge until ready to use.
Into a large mixing bowl, add the flour, baking powder, and kosher salt. Mix with a whisk until combined.
Into a separate medium-sized mixing bowl, add the egg, pumpkin puree, vanilla extract, cinnamon, and brown sugar, and mix with a whisk until well combined.
Add the heavy cream which is at room temperature and mix well until combined.
Add the cold refrigerated butter cubes to the flour mixture, and using a pastry cutter, cut the butter into the flour until the butter is about the size of peas.
Pour the wet mixture into the flour mixture and mix until just combined! Do not overmix this dough.
Transfer the dough to a floured parchment paper baking sheet and shape it into a round. Cut into 8 pieces using a pastry scraper.
Brush off the extra flour, and brush the scones with heavy cream and sprinkle sugar on top for an extra crunch.
Bake the scones in a 200c (400f) preheated oven for 20-25 minutes, depending if you like your scones soft or crunchy on top.
Let the scones cool to room temperature and top them with a simple glaze made by mixing powder sugar, vanilla extract and milk until you get your desired thickness.
Top them with toasted chopped pecans for an extra crunch and serve!