In a bowl with an electric mixer with whisk attachment beat 1 cup of cold heavy cream on medium high speed until stiff peaks form, about 3 minutes. Chill until ready to use.
In a small saucepan, heat ½ cup heavy cream over medium heat, until hot but boiling. Or you can heat in your microwave (for me this takes about 45 seconds). Remove from the heat and add the chopped chocolate. Let sit for 5 minutes then stir until smooth. Set aside to thickn while you make the filling. 4 ounces (113 g) bittersweet chocolate
In the bowl of the stand mixer fitted with a paddle attachment, beat the softened cream cheese and granulated sugar on medium-high speed until smooth and creamy, about 2 minutes, scraping down the sides and bottom of the bowl as needed. 16 ounces (454 g) cream cheese 1 cup (200 g) granulated sugar
Add the sour cream, cocoa powder, vanilla, and salt and beat until combined until just combined. ¼ cup (57 g) sour cream ⅓ cup (28 g) unsweetened cocoa powder 2 teaspoons vanilla extract ¼ teaspoon fine sea salt
Beat in the ganache (heavy cream and chocolate mixture) from earlier.
Fold gently in the whipped cream until evenly combined. Be careful to not overmix and deflate the whipped cream.
Pour the batter evenly into the crust. Chill in the fridge for at least 6 hours, or over night.