I made something similar years ago, but unfortunately the blog I linked to is gone. So I looked up another recipe and found this on chefkoch.de (a German recipe site):
|125 g||chocolate (the bitter the better)|
|2 Tsp||vanilla extract or vanilla sugar or vanilla|
|200 g||creamcheese or Quark|
Melt chocolate and butter together. Beat two eggs with 200g sugar. Mix 1Tsp vanilla with the eggs, chocolate-butter, flour and salt. Spread in a brownie form. Mix the creamcheese with the third egg, 70g sugar and 1Tsp Vanilla. Pour on the brownie mix.
Bake in the oven @220°C for ~25minutes until still sticky in the middle. Serve and enjoy!