1. Preheat your oven to 350 degrees.
2. Prepare a 9×9 inch square baking pan. You can lightly grease and dust the pan (see notes), or I like to line the bottom of the pan with parchment paper.

The Brownie:

1. In a saucepan on low heat, melt together the butter and sugar. Then transfer the mixture into a mixing bowl, and set aside to cool.
2. In a separate bowl, sift together flour, cocoa powder and salt. Set aside.
3. Once the sugar mix has cooled slightly, add the eggs and vanilla and mix until well combined.
4. Combine the wet ingredients with the dry. Mix well.
5. Add the chocolate chips. Set aside.

The Cream Cheese Swirl:

1. Beat together the chocolate cream cheese, sugar, vanilla and egg yolk, until well combined and smooth.

Putting it all together:

1. Once you have the brownie mix all ready, spread half of the batter in your prepared baking dish.
2. Then add half of the cream cheese mix in clumps over your brownie. (If you want to see a picture of what this looks like, refer to my other brownie post here.)
3. Using a knife, swirl the cream cheese mix, until you have a marbling effect like in the pictures above.
4. Then spread on the remaining brownie batter.
5. Then add the remaining cream cheese batter in clumps, and swirl again.
6. Bake for approximately 1 hour and 15 minutes – mine took longer – I had to bake it for 1 hr 30 min. The brownie will be done when the edges of the brownie have puffed, the centre of the cake feels firm to the touch, and a toothpick when inserted comes out clean.
7. When the cake is done, remove from the oven and let cool to room temperature.
8. Chill in the fridge for at least 2-3 hours.