Whisk together confectioner’s sugar and milk in a heat proof bowl. Whisk in the cocoa powder, salt, vanilla, and oil. Whisk in the dark chocolate.
Place bowl on top of a pot full of simmering water and cook until smooth and runs off the whisk. If the glaze is too thick, add a bit of water about 1 tablespoon at a time. You can go back!
Video
Notes
This is enough glaze for 12 donuts; 1, 9-12 cup bundt cake, or 24 cupcakes.