01 -
Line a plate with parchment paper. Pour the pistachio spread on top and spread it into a thick sheet. If your pistachio spread is thick enough, you can also scoop it out into small dollops with a spoon. Freeze for at least 1 hour or overnight until solid. If you've gone with the sheet method, use a knife to cut the frozen sheet into squares and pop it back in the freezer until needed.
02 -
Line a cutting board or plate with parchment paper. This will be used to chill the cookie dough on. 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, add the melted and cooled butter, brown sugar, and granulated sugar. Whisk until combined. Add the egg and vanilla extract. Whisk until smooth and thick.
05 -
Add the flour mixture and whisk until just barely combined with some flour patches left.
06 -
Add the chopped chocolate and chopped pistachios. Switch to a spatula to fold the chocolate and pistachios in and finish mixing the dough until just combined.
07 -
Use a 4-tablespoon cookie scoop to scoop the cookie dough. Release the cookie dough balls onto your lined board. Chill the dough in the fridge for about 1 hour or until firm.
08 -
Preheat the oven to 350°F. Line a baking sheet with parchment paper.
09 -
Use your fingers to press a dough ball into a flat round. Place a frozen stack (or a dollop) of pistachio cream (about 3-4 squares depending on the thickness) in the middle and close the cookie dough around it to seal it in the middle.
10 -
Place the stuffed cookie dough balls on your lined baking sheet, leaving about 2" in between each cookie for spreading. Press a few more chocolate chunks, pistachios, and frozen pistachio cream chunks on top of each cookie dough ball.
11 -
Bake cookies for about 11-12 minutes or until the edges are set but the cookies are still soft. Immediately sprinkle with flaky salt. Let the cookies cool on the baking sheet for 5 minutes and then enjoy them warm for gooey centers or let them cool. The pistachio filling will firm up as they cool.