Preheat the oven to 350?F (175?C). Grease and line a baking pan with parchment paper.

In a mixing bowl, whisk together the sugar and melted butter until combined.

Add the eggs and vanilla extract, mixing until smooth.

Sift in the cocoa powder, flour, and salt, folding gently until just combined.

Pour the brownie batter into the prepared baking pan and spread evenly.

In another bowl, beat the softened cream cheese until smooth.

Add the powdered sugar, pistachio paste, and vanilla extract, mixing until well combined.

Spread the cream cheese mixture over the brownie batter in the pan.

Sprinkle chopped pistachios on top of the cream cheese layer.

Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.

Allow to cool in the pan before slicing into squares.