Preheat the oven to 425 degrees F and line two standard or one large baking sheet with parchment.
In a large bowl, whisk together the flour, baking powder, baking soda, ginger, cinnamon, allspice, cloves, nutmeg, and salt. Cut the cold butter into the dry ingredients using a pastry blender or clean fingers. The mixture should be crumbly with a few pea-sized bits here and there.
In a separate bowl, whisk together the brown sugar, cream, molasses, and vanilla. Pour over the flour mixture and use a spatula to fold until a dough begins to form. The dough will look like it’s barely coming together. Knead and pinch the dough in the bowl until combined (the less you work the dough, the flakier the scones will be).
Divide the dough in half and flatten into two round discs, about 7 inches each in diameter. Cut both discs into 6 pieces. Brush melted butter on top of each piece.
Bake (in batches if needed) for 10-12 minutes, until tops are golden brown.
While the scones are baking, prepare the glaze. Stir together the confectioners’ sugar, cream, and vanilla until smooth. Add additional cream if a thinner texture is desired. Drizzle the glaze over the scones using a spatula or whisk.