Preheat oven to 350, well grease a 12 cup bundt pan.
In a large bowl, mix together the cake and pudding mixes, sour cream, oil, beaten eggs and water. Mix with an electric mixer for about 2 minutes.Scraping down the sides until semi smooth then stir in your chips last.
Pour batter into your bundt pan and bake for 50 to 55 minutes, or until the top is springy and a toothpick comes out clean once inserted.
Cool this cake before inverting onto a plate at least a good half an hour. It is a very thick but moist cake, this also give you time to prepare your glaze.
Melt your butter in a small heavy saucepan over low (I can't express that enough) heat. Add the cocoa powder and cream stirring until the mixture thickens, about 2 minutes. DO NOT BOIL. Remove the pan from the heat and stir in your confectioners' sugar and vanilla until the mixture is smooth. Spoon this mixture over your cake. I don't always use all of this for a little does go a long way. just makes it pretty. Your choice to add any extra confectioners' sugar sprinkled on top....kinda adds to this. But not needed, just a pretty garnish. Happy baking and ENJOY!!