To start, preheat the oven to 160�C.
Melt the cooking chocolate along with butter as usual. Mix well and let it chill.
Beat the eggs with castor sugar and vanilla essence. Beat until it�s mixed well.
In a separate container, sift the flour.
Pour in the chocolate mixture earlier into the egg mixture and mix. After that, add in the sifted self-raising flour little by little. Then, mix evenly.
Line a pan with baking paper and grease with butter. Pour in the brownie mixture you�ve just made earlier.
Bake the brownies at 160�C for 30-40 minutes.
To make the spider-web on top of the brownies: Start melting the marshmallows in the microwave for 30 seconds in a microwave-safe bowl and stir till it�s smooth.
Using a fork, dip the fork into the melted marshmallow and drizzle over the brownies to make it look like a spiderweb. Serve immediately.