01 -
Line a plate with parchment paper. Spread pistachio cream into a thick sheet or scoop dollops with a spoon. Freeze for at least 1 hour or overnight until solid. If using the sheet method, cut into squares once frozen and return to the freezer.
02 -
Line a cutting board or plate with parchment paper to chill cookie dough later. Set aside.
03 -
In a small bowl, stir together flour, cornstarch, baking powder, baking soda, and salt. Set aside.
04 -
In a large mixing bowl, whisk together melted butter, brown sugar, and granulated sugar until combined. Add the egg and vanilla extract. Whisk until smooth and thick.
05 -
Add the dry ingredients to the wet ingredients and whisk until just combined, leaving a few flour patches.
06 -
Fold in the chopped chocolate and pistachios using a spatula. Mix until just combined.
07 -
Use a 4-tablespoon cookie scoop to portion dough. Place dough balls onto the prepared parchment-lined board. Chill in the fridge for 1 hour until firm.
08 -
Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
09 -
Flatten each dough ball into a round and place a frozen piece of pistachio cream in the center. Wrap the dough around the filling to seal it completely.
10 -
Place stuffed cookie dough balls on the baking sheet, leaving 2 inches for spreading. Press additional chocolate chunks, pistachios, and pistachio cream pieces on top.
11 -
Bake cookies for 11-12 minutes, or until edges are set but centers remain soft. Sprinkle flaky salt on top immediately and let cool for 5 minutes. Serve warm for gooey centers.