Preheat oven to 350 degrees. Spray bundt pan with cooking spray.
Beat cake mix, pudding, eggs, sour cream, oil and water on medium speed until mixed about 2 minutes. Fold in chocolate chips with a spatula. Pour into the bundt pan.
Bake 50 minutes or until a toothpick comes out clean. Allow cake to cool 15 minutes. Turn cake pan over onto cooling rack and carefully lift pan to remove cake. Cool cake completely. Carefully, transfer to a serving platter.
In a saucepan over medium/low heat, add cream and bring to a low simmer. Reduce heat to low and add the chocolate chips and whisk just until chocolate chips are melted. Continue whisking until mixture is shiny and smooth. Let cool 15-20 minutes
Drizzle ganache over the cake.