Preheat your oven to 375°F. Lightly grease a baking sheet, or line it with parchment., To make the scones: In a large mixing bowl, blend the flours, cocoa, espresso powder, sugar, baking powder, baking soda, and salt together thoroughly., Using a stand mixer equipped with the beater paddle; or a pastry blender, pastry fork, or your fingertips, work in the butter until the mixture is unevenly crumbly., Stir in the chocolate chips., Whisk together the vanilla, egg, and milk., Add the liquid ingredients to the dry ingredients, stirring until the mixture is evenly moist. If necessary, add an additional tablespoon or so of milk, enough to make the dough come together., Mix 3 tablespoons confectioners' sugar with 1 teaspoon cocoa powder, and sprinkle it on your parchment-lined (or lightly greased) baking sheet. You're using this sugar mixture in place of the usual flour, to keep the scones from sticking to the pan as you shape them., Divide the dough in half, and place the two pieces onto the baking sheet. Pat them gently into two 6" circles, each about 3/4" thick., Cut each circle into 6 wedge-shaped pieces with a bench knife or bowl scraper (or sharp knife), pressing down firmly without sawing. You'll find it easier if you dip your cutter in flour after each cut. Make sure you press it into the dough quickly, without twisting or sawing. This shears the dough cleanly rather than pressing it together, which allows the scones to rise higher. Separate the scones a bit, but leave them in their circle; try to leave about 1" between them at the outer edge of the circle., Bake the scones for 18 to 23 minutes, until they lose their moist look, and a cake tester inserted into the center of one comes out clean; or with just a smear of chocolate from a melting chip., Remove the scones from the oven, and transfer them to a rack to cool., To make the glaze: Place the chocolate chips and half-and-half or creamer in a microwave-safe bowl or small saucepan. Heat in the microwave (or over low heat) until the cream is very hot. Remove from the heat, and stir until the chips melt, and the mixture is smooth., Drizzle/spread the glaze over the cooled scones.