

Whisk together butter, sugar, vanilla, and egg in a mixing bowl until well combined.
Gradually mix the flour, cocoa powder, salt, and baking soda.
Fold in the dark chocolate drops and coarsely chopped pistachios until evenly distributed.
Roll the dough into a large log shape, wrap it in plastic wrap, and chill for at least 1 hour. The firmer the dough, the easier it will be to slice.
Preheat the oven to 175°C. Slice the chilled dough into 2 cm thick pieces and arrange them on a baking tray lined with parchment paper, ensuring sufficient space between the cookies.
Bake the cookies for 12 to 15 minutes, then transfer them to wire racks to cool completely.