Whisk caster sugar, brown sugar, and egg until pale.
Melt butter and chocolate, then mix into the egg mixture.
Sift in flour and cocoa powder. Pour into 3 small round rings.
Whisk cream cheese, sugar, cream, flour, vanilla, and eggs until smooth.
Pour the cheesecake batter over the brownie base.
Preheat oven to 200°C. Bake for 20 minutes.
