Preparation
Weigh and arrange all ingredients for use.
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In a pan, melt the dark chocolate with the butter over a low heat, stirring.
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Mix the sugar, salt and vanilla sugar in a bowl and stir in the melted chocolate.
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Gradually beat in the eggs.
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Mix everything until smooth.
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Sieve in the flour and cornflour and fold into the chocolate mixture.
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Preheat the oven to 180°C (160°C fan, gas 4). Line a cake tin with baking paper. Spoon the chocolate mixture into the tin and spread level.
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Scatter over the chocolate chips.
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Bake in the oven for about 25 minutes. The cake should still be slightly crusty on top but still slightly moist inside. Allow to cool completely.
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Turn out the brownie and cut into pieces.
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