Preheat oven to 350 degrees F.

Grease and flour a standard size bundt pan (make sure to grease it really well so the cake doesn't stick! I spread a thin layer of shortening all over the inside of the pan, then sprinkle a little flour all around and pat and shake the pan until it is evenly coated.)  

In a large mixing bowl, whisk together flour, sugar, baking soda, salt and cinnamon, set aside.

Add butter to a medium saucepan over medium heat. Once butter has melted, stir in oil, cocoa powder and water and bring mixture just to a boil, whisking constantly. Pour hot butter mixture into flour mixture and stir. 

Stir in buttermilk, eggs and vanilla and whisk mixture until well combined. Fold in mini chocolate chips, if using.

Pour mixture into prepared bundt pan and bake 45-55 minutes or until toothpick inserted in center comes out with a few moist crumbs. 

Cool cake in the pan for 5 minutes, then invert onto a wire cooling rack to cool completely. Once cake has cooled, make ganache.

Place cream in a large microwave safe bowl and heat for about 2 minutes, or until the cream is simmering.

Carefully pour chocolate morsels into cream and allow mixture to sit for 5 minutes. Whisk the chocolate and cream until shiny and smooth, about 1 minute.

Use a large spoon to drizzle the ganache over the cooled cake. Sprinkle with remaining mini chocolate chips, if desired.