Begin by preheating your oven to 325°F (160°C). This ensures that the cheesecake cooks evenly.
In a medium saucepan, melt the 4 oz of bittersweet chocolate chips and 1/2 cup of butter over low heat. Stir until smooth. Remove from heat and let cool slightly.
In a separate bowl, combine the melted chocolate mixture with 3/4 cup granulated sugar, 3 eggs, 1/2 cup cocoa powder, 1 teaspoon vanilla extract, and a pinch of salt. Mix until well combined.
Pour this mixture into a greased 9-inch springform pan and spread it evenly. Bake for 10-12 minutes, then remove from the oven and let it cool completely.
In a large mixing bowl, beat the 32 oz of cream cheese until smooth and creamy.
Gradually add in 1 cup of granulated sugar and mix until fully incorporated.
Add the 1/4 cup cocoa powder, 1 teaspoon vanilla extract, 1 cup bittersweet chocolate chips (melted), and 1 cup dark chocolate chips. Mix until the filling is smooth.
Finally, add in the 4 large eggs one at a time, mixing on low speed until just combined. Be careful not to overmix.
Pour the cheesecake filling over the cooled crust in the springform pan. Smooth the top with a spatula to ensure an even layer.
Bake for 50-60 minutes, or until the edges are set but the center still has a slight jiggle. Turn off the oven and crack the door, allowing the cheesecake to cool slowly for about an hour.
While the cheesecake is cooling, prepare the ganache. In a small saucepan, heat 1 cup of heavy cream until just simmering. Remove from heat and add the 10 oz of semi-sweet chocolate chips. Let sit for a few minutes, then stir until smooth.
Allow the ganache to cool slightly before pouring it over the cooled cheesecake.
Once the ganache is poured over the cheesecake, refrigerate it for at least 4 hours, preferably overnight. This allows the flavors to meld and the cheesecake to set perfectly.
Before serving, whip 1 cup of cold heavy cream with 1 tablespoon of powdered sugar, 1/4 cup cocoa powder, and 1 teaspoon vanilla extract until soft peaks form.
Spread or pipe the whipped cream over the cheesecake for a beautiful finish.