01 -
Whip together the unsalted butter, granulated sugar, and soft brown sugar until creamy and smooth. Incorporate the egg and vanilla extract. Gently fold in the plain flour, baking powder, baking soda, and salt. Stir in the dark chocolate pieces. Chill the dough in the refrigerator while preparing the brownie layer.
02 -
Preheat oven to 340°F (170°C). Line an 8x8-inch (20x20 cm) baking dish with baking paper.
03 -
Melt the butter and dark chocolate together carefully, stirring until smooth. In a separate bowl, whisk eggs, granulated sugar, soft brown sugar, and vanilla essence for 3 minutes until thick and frothy. Combine the melted chocolate mixture with the egg mixture. Sift plain flour, cocoa powder, and salt into the bowl, and fold gently until fully incorporated.
04 -
Pour half of the brownie batter into the prepared baking dish and spread evenly. Drop spoonfuls of Nutella and pistachio cream randomly over this layer. Cover with remaining brownie batter and smooth gently over the top.
05 -
Scoop chilled cookie dough pieces and evenly dot across the surface of the brownie batter.
06 -
Bake for approximately 28 minutes for a slightly gooey center. For a firmer texture, extend baking an additional 2-5 minutes. The top should be golden and edges starting to pull away from the pan.
07 -
Allow to cool in the pan before slicing. For clean portions, chill in the refrigerator for one hour prior to cutting.