2. Sift the flour, cocoa, baking soda and salt in a bowl. Add the sugar, buttermilk, oil and vanilla and stir to combine (do not overmix).
3. Fill each baking cup 2/3 full. Bake until a skewer inserted into the middle of a cupcake comes out clean, about 20 minutes. Allow the cupcakes to cool for 5 minutes before removing them from the pan.
4. When the cupcakes are cool, melt the chocolate over a double boiler. Let the chocolate cool until it thickens slightly. Using a spoon, drizzle the cupcakes with the melted chocolate.
Makes 12 standard size cupcakes or 24 miniture cupcakes.