Once the cakes are completely cooled and chilled, pull them out of the freezer. Place a dab of frosting on the center of your cake plate and place the first layer of chocolate sponge on the cake plate.
Next, add 1 cup of frosting on top of the first sponge layer and spread out.
Add the second sponge layer onto of the frosting.
Frost your entire cake with the pumpkin cream cheese frosting.
If you want the chocolatey, marble look go ahead and make up your ganache and dip your frosting spatula into a bit of the ganache and swipe it onto your cake. I like to swirl the frosting and ganache around the outside of the cake (think more like stripes, instead of little swirls)
I place the rest of the ganache into a ziplock bag and allow it to cool (putting it in the fridge helps) until it is about the consistency of pancake batter.
Next snip the corner of the ziplock bag and squeeze the ganache around the top edge of the cake allowing the ganache to drip over the sides.
Lastly fill in the top with the remaining ganache, you can use a spatula to help it spread out if it is a little bit thick.