Preheat oven to 475ยบ F. Prepare a large baking sheet with a piece of parchment or a silicon baking mat. Set aside.
Add flour and shortening to a large bowl. Cut shortening into the flour using a pastry blender, two knives or a fork until the mixture resembles coarse meal. Add milk, pumpkin, brown sugar, and pumpkin pie spice to the flour mixture. Stir together until well-combined. Pour onto a floured paper towel or pastry cloth. Lightly flour your hands and carefully fold one edge over on top of the dough, repeating until all edges have been folded over. Lightly flour a rolling pin and cut your biscuits into large squares or use a round biscuit cutter. Place biscuits onto the prepared pan and bake for 12 minutes. Remove from the oven and brush with melted butter and sprinkle with coarse sugar for decoration.