In a small sauce pan, heat the cream over medium heat. When it comes to a gentle boil turn off the heat and immediately add your chopped chocolate. Swirl the pot to make sure the chocolate is completely covered by the cream. let stand for 5 minutes and then gently whisk it until smooth. Pour the ganache into a medium sized bowl and allow to cool for a few minutes.
Once the ganache is cooled pour in about a cup of the cheesecake batter and gently whisk together. Add a total of a 1/3 of the cheesecake batter to the bowl of ganache.
Place a pastry bag fitted with a large round tip in a measuring cup and fill the bag 1/2 full with the chocolate cheesecake batter.
Pour the ginger cheesecake batter over the cooled crust and then pipe the chocolate batter in stripes over it. You will have to refill your bag a few times and may have to go over the lines several times until you have used up all of the chocolate batter.
Using a chopstick or skewer draw a line back and forth from one corner to the other through the stripes in the cheesecake batter. Don’t go too deep or you will disturb the crust. Very gently tap the cheesecake on the counter to get out any air bubbles.
Place in the oven and bake for about 25 minutes or until just set. be sure not to over bake or the cheesecake will crack. It will jiggle like jello when it is ready.
Remove from oven and immediately run a knife around the outside edge. this will also prevent the cheesecake from cracking. Let it cool to room temperature and then refrigerate for at least 2 hours before cutting.
Very quickly wave the tray over the stove to loosen it from the tray. Just a few seconds. Flip it over onto another baking sheet or large cutting board. Peel off the silpat or parchment.
Flip the cheesecake onto a cutting board and remove the plastic. Using a very thin sharp Knife dipped in hot water cut the cheesecake into bars. First trim off the edge then I cut mine into 2-inch squares. If you cut the sheet in 8 rows along the long side and 6 along the short side you will have just enough.