In a large bowl, whisk together the butter and sugar until combined. Add in the dry ingredients and the eggs, mixing until the batter is just combined. Whisk in the vanilla extract, then stir in the milk until the batter is smooth. Fold in the chopped chocolate. Use a spoon and add the batter to the donut pan until each mold is about 3/4 of the way full. Bake the donuts for 13 to 15 minutes, until they are set and slightly golden. Remove and let cool. Once cool, dip each donut in the ganache and drizzle with the orange glaze. Serve immediately.