01 -
Preheat the oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper or grease lightly. In a mixing bowl, combine the melted butter, white sugar, and brown sugar until smooth. Whisk in the eggs and vanilla. In another bowl, mix the flour, cocoa powder, salt, and baking powder. Gently fold the dry mixture into the wet until evenly blended.
02 -
Beat cream cheese, sugar, egg, vanilla, and pistachio butter together in a medium bowl until creamy. Optionally, add green food coloring for a pistachio hue.
03 -
Spread ¾ of the brownie mixture evenly in the prepared dish. Drop spoonfuls of the pistachio cheesecake mix on top. Add dollops of the remaining brownie batter, then swirl gently with a knife to create a marbled effect. Sprinkle chopped pistachios evenly over the surface.
04 -
Place in the oven and bake for 30–35 minutes, or until a toothpick inserted into the center has a few moist crumbs. Cool completely before slicing.
05 -
Serve at room temperature, or chill for a firmer cheesecake texture. Keep leftovers in the fridge within an airtight container for up to 5 days.