Preheat your oven to 175°C (350°F) and line your 8-inch square baking pan with parchment paper, leaving some overhang for easy removal.
Place the dark chocolate and butter in a heatproof bowl and melt them together over a double boiler or in short bursts in the microwave, stirring until smooth and glossy. The aroma of melting chocolate should fill the air, and the mixture will be silky to the touch.
In a separate bowl, whisk the eggs and sugar together with a hand whisk or electric mixer until the mixture is fluffy, pale, and slightly thickened. You should see ribbons forming when you lift the whisk.
Pour the melted chocolate mixture into the eggs and sugar, gently folding them together with a rubber spatula until well combined and smooth. The batter should be shiny and thick.
Sift the all-purpose flour and salt into the chocolate mixture, then fold gently until just incorporated. Avoid overmixing to keep the brownies fudgy and tender.
Pour the batter into your prepared baking pan and smooth the top with the spatula, spreading it evenly to the edges. The batter will be thick and rich, with a dark, luscious appearance.
Bake the brownies for 25 to 30 minutes, until the top is slightly cracked and a toothpick inserted into the center comes out with moist crumbs. The smell of baking chocolate will be irresistible.
Remove the pan from the oven and let the brownies cool in the pan for about 15 minutes. They will set further as they cool, developing a dense, fudgy texture.
Transfer the brownies to a wire rack using the parchment overhang, and allow them to cool completely. Once cooled, cut into squares and decorate with spooky colors or edible decorations if desired.
Enjoy your hauntingly delicious brownies, perfect for Halloween festivities or a dark chocolate treat!
