Chocolate Cake with Cream Cheese Ganache

We celebrated DH's birthday the other week.  It was the big 4-0 and I felt that we should be irreverent about it (totally sticking our tongues out at this particular milestone).  One of his presents was a book titled Fart Proudly (featuring satirical writings by Benjamin Franklin).  After that, I had to make up for it by making him a yummy birthday cake. I looked at a Penzey's recipe and said "