In a large bowl, whisk together the flour, brown sugar, baking powder, salt, cinnamon, nutmeg, and ginger. Cut in the cold butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs.
In a separate bowl, whisk together the pumpkin puree, heavy cream, egg, and vanilla extract. Pour this mixture into the dry ingredients and gently mix until just combined.
Turn the dough onto a floured surface and shape it into a 1-inch thick disc. Cut into 8 wedges and place them on a lined baking sheet. Bake at 400°F (200°C) for 18 minutes or until golden brown.
Let the scones cool before drizzling with the glaze made from powdered sugar, milk, and vanilla extract. Enjoy warm!