Dark Chocolate Brownie Cake

I recently made this for my daughter's birthday.  It's easy and so, so delicious!  Every bite is a piece of heaven with its decadence from the rich dark chocolate flavor.  The ganache on top is also dark chocolate and very rich and decadent.  YUM!  Enjoy!
For cake:
-1 (15.25 oz) box dark chocolate fudge cake mix
-1 (18.2 oz) box dark chocolate fudge brownie mix
-4 large eggs
-1 cup vegetable oil
-1 1/4 cup water
For ganache:
-1 cup heavy cream
-12 oz dark chocolate chips
Preheat oven to 350 F.  Coat a bundt cake pan with baking cooking spray (the one with butter and flour).  Set aside.
In your electric mixer's bowl, combine all cake ingredients.  Mix very well, then pour in prepared pan.  Bake in preheated oven for 50 minutes or until toothpick comes out clean.
Place pan with cake on wire rack and cool for 20 minutes.  Carefully, turn the cake on the wire rack and let cool completely.  Once cooled, carefully transfer onto serving plate.
Once all that is done, pour ganache ingredients in large saucepan.  Melt over medium-low heat, stirring continuously. Remove from heat and let it sit for 5 minutes.  Give it a good stir until nice and smooth.  Pour that goodness on top of the cooled cake.  Enjoy and store any leftovers in the fridge. YUM!