Step 1: Preheat the Oven. Start by preheating your oven to 350°F (175°C). This ensures that your brownies bake evenly.
Step 2: Prepare the Baking Dish. Grease a 9x9 inch baking dish with a little butter or line it with parchment paper. This will make it easier to remove the brownies later.
Step 3: Melt the Chocolate. In a heatproof bowl, combine the dark chocolate and butter. Melt them together over a pot of simmering water, stirring occasionally until smooth. Alternatively, you can microwave them in 30-second intervals until melted.
Step 4: Mix the Batter. In a large mixing bowl, whisk together the melted chocolate mixture and superfine sugar until well combined. Add the beaten eggs and mix until completely incorporated.
Step 5: Add Dry Ingredients. Fold in the self-rising flour gently, being careful not to overmix. This will ensure your brownies remain tender.
Step 6: Incorporate Nuts and White Chocolate. Stir in the chopped pistachio nuts (or walnuts) and white chocolate pieces until evenly distributed throughout the batter.
Step 7: Bake. Pour the brownie batter into the prepared baking dish and smooth the top with a spatula. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Step 8: Cool and Serve. Once baked, remove the brownies from the oven and allow them to cool in the pan for about 10-15 minutes. Then, transfer them to a wire rack to cool completely. Before serving, dust with sifted confectioners sugar for an elegant finish.
