01 -
Preheat the oven to 350°F (175°C). Grease an 8-inch cake tin and line with parchment paper.
02 -
Melt unsalted butter and dark chocolate together in a microwave or over a double boiler. Allow to cool slightly.
03 -
Whisk in eggs, granulated sugar, and brown sugar until blended. Fold in flour, unsweetened cocoa powder, and salt until just combined. Do not overmix.
04 -
Pour the brownie batter into the prepared tin. Bake for 15 to 20 minutes until the surface is set but the center is still slightly soft.
05 -
In a separate bowl, beat cream cheese until smooth. Add granulated sugar, vanilla extract, sour cream, flour, and heavy cream. Mix until fully combined and creamy.
06 -
Pour the cheesecake mixture over the partially baked brownie base, smoothing out the top with a spatula.
07 -
Return the tin to the oven and bake for 30 to 35 minutes until the cheesecake is just set and a toothpick inserted into the center comes out with moist crumbs.
08 -
Remove from oven and allow to cool to room temperature. Refrigerate for at least 4 hours or overnight for best texture.
09 -
Slice chilled brownie cheesecake into even portions and serve.