Preheat your oven to 175°C (350°F) and line an 8-inch square baking pan with parchment paper, letting the edges hang over for easy removal.
Combine the butter and chopped dark chocolate in a double boiler or microwave, heating gently and stirring until smooth and glossy, filling the kitchen with a rich chocolate aroma.
Whisk the eggs and sugar together in a large bowl until slightly frothy and the mixture becomes lighter in color, about 2 minutes.
Pour the cooled chocolate mixture into the egg and sugar blend, gently folding until combined and smooth.
Sift the flour and cocoa powder into the bowl, then fold gently until just incorporated, taking care not to overmix to keep the brownies fudgy.
Pour the batter into your prepared pan, spreading it evenly with a spatula to create a smooth surface.
Bake in the preheated oven for 20-25 minutes, until the edges are set and slightly cracked, but the center still jiggles gently when shaken.
Remove the pan from the oven and let the brownies cool in the pan for about 15 minutes, then lift them out using the parchment overhang and transfer to a wire rack to cool completely.
Once cooled, cut the brownies into squares using a sharp knife, creating clean edges.
Use decorative icing or melted dark chocolate to draw creepy faces or designs on each brownie, adding spooky flair for Halloween.
Let the decorations set for a few minutes before serving, ensuring your spooky brownies are ready to impress and delight.
