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- Preheat the oven to gas 4, 180°C, fan 160°C. Line a muffin tin with 12 paper cases. In a bowl, beat the butter and sugar until light and fluffy. Add the vanilla, then beat in the eggs, one by one, each with a spoonful of flour, until smooth. Fold in the remaining flour and stir until just combined.
- Put half the mixture into another bowl. Add the cocoa and milk chocolate to one bowl and milk to the other.
- Fill each case with spoonfuls of both mixtures, then swirl with a knife or skewer to create a marble effect. Bake for 20-25 mins.
- To make the buttercream, beat the butter in a bowl until pale and creamy, then add the vanilla. Add the icing sugar in 3 stages, beating between each addition, until fully combined. Divide between 2 bowls. Mix the melted dark chocolate into one bowl. Add both to a large bowl and swirl briefly with a knife to create a marble effect. Put into a piping bag with an open star nozzle.
- Pipe the chocolate icing on top of the cupcakes, then sprinkle with chocolate curls. The iced cupcakes will last for 3 days in a sealed container.
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