In a 8x8 square pan lined with parchment paper or sprayed with non-stick spray, pour in about 90% of the brownie batter (leave about ⅓ cup of the batter behind).
Make dollops of the cheesecake mixture on top of the brownie batter. Gently smooth the cheesecake mixture over so that it makes an even layer.
Dollop the brownie mixture over the cheesecake mixture in 16 even dots over the top OR use a pipping bag to pipe horizontal lines over the top. Use a toothpick to make chocolate swirls.
Bake for 45 minutes until the edges are crisp and the centre is set.
Allow to cool completely, ideally in the fridge overnight.
Cut into 16 even pieces (more or less depending on the size you like) and enjoy.