Crust

1. In a food processor pulse the graham crackers until a fine crumb is reached, pour into a large bowl. Whisk in the sugar until evenly combined then stir in the melted butter. The butter should be evenly distributed and the mixture should look like wet sand.
2. Lightly spray a 9-inch springform pan with non-stick cooking spray then pour the crust inside. Use the bottom of a measuring cup to gently press the crumbs into an even layer and up the sides of the pan. Place the pan in the freezer to set while you prepare the filling.

Cheesecake Filling

1. In the bowl of an electric stand mixer fitted with a whisk attachment or large bowl with a handheld electric mixer beat the heavy cream until stiff peaks form.
2. Scoop the whipped cream into a clean bowl then add the softened cream cheese to the dirty cream bowl. Beat the cream cheese until softened, 1-2 minutes. Scrape down the sides of the bowl to ensure all of the cream cheese is softened.
3. Sift in the confectioner's sugar and cocoa powder and mix on low until fully incorporated. Then add the melted chocolate, sour cream, and vanilla extract, making sure to scrape down the sides of the bowl so everything is evenly combined.
4. Add half of the whipped cream to the cream cheese mixture and use a spatula to gently fold the whipped cream in, when combined add remaining whipped cream and fold again. Be careful not to overfold, as this will deflate the cream.
5. Pour cheesecake filling into the prepared crust and use an offset spatula to spread it into an even layer. Cover the cheesecake with foil or plastic wrap and place in the fridge for at least 8 hours or overnight.

Topping

1. After the cheesecake has set make the chocolate ganache. Add the chopped chocolate to a heatproof bowl. Warm the heavy cream in a small saucepan or in the microwave. Pour warmed cream over chopped chocolate and let sit for 5 minutes to melt the chocolate. Whisk to combine.
2. Release the cheesecake from the springform pan and use a spatula to transfer the cheesecake from the bottom of the pan to a serving plate. Drizzle on the chocolate ganache then top with fresh whipped cream. Store leftovers in the fridge for up to 5 days.