1Preheat your oven to 180°C (350°F). Grease and line a 20cm (8-inch) square baking pan with parchment paper.
In a medium bowl, whisk together the all-purpose flour, unsweetened cocoa powder, and salt. Set aside.
In a separate large bowl, melt the unsalted butter (either in the microwave or over a saucepan). Allow it to cool slightly.
Add the granulated sugar to the melted butter and whisk until well combined.
Beat in the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
Gradually fold the dry ingredients into the wet mixture, mixing just until combined. Do not overmix.
Gently fold in the chopped walnuts.
Pour the batter into the prepared baking pan and spread it evenly.
Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Allow the brownies to cool completely in the pan before lifting them out and cutting into squares. Enjoy!