Preheat the oven to 350F. In a large mixing bowl, mash the bananas with a fork. Add the rest of the cake ingredients and mix well.
Pour the batter into a very well greased bundt pan. Bake for 40-45 minutes, or until you can insert a toothpick and it comes out clean. Cool the cake for 10-15 minutes in the pan, and then transfer to a plate or cooling rack.
While the cake it cooling, microwave the half and half cream for 1-2 minutes, or until it's very hot. Pour it over the chocolate chunks and wait 5 minutes. Stir the mixture well until the chocolate is fully incorporated. Wait until the cake is cool enough to touch, and then drizzle the ganache over the entire cake. Wait 15 minutes until the ganache sets, and enjoy!