Preheat oven to 350 degrees F. Spray a 9x9 inch square baking pan with nonstick spray and line with parchment paper, leaving enough overhang to use as a sling to pull the brownies out of the pan.

In a large bowl, prepare the brownie mix as directed. Then set aside.

Add the cream cheese and sugar to a bowl of a stand mixer fitted with the paddle attachment. Beat until smooth and creamy.

Add the egg, vanilla, and salt. Beat until well combined.

Remove 1/2 cup of the brownie batter and set aside. Transfer the remaining brownie batter to the prepared baking pan. Carefully spread the cheesecake filling over the brownie layer.

Top with the remaining brownie batter and swirl over the cheesecake layer. Bake for 30 minutes at 350 degrees.

Cool completely before slicing and refrigerate until ready to serve.