Preheat the oven to 180°C (fan 160°C/350°F/Gas 4). Line a 12-hole muffin tin with paper cupcake or muffin cases.

Put all the cake ingredients into a large bowl and beat with an electric hand whisk or a wooden spoon until smooth and evenly mixed. Divide the mixture evenly between the paper cases.

Bake for 20-25 minutes, or until the cakes are well risen and firm on top. Transfer to a wire rack to cool.

Make the icing: put the butter, vanilla extract, 2 tablespoons of the milk, and half the icing sugar in a large bowl and beat until smooth. Beat in the remaining icing sugar, and pour in the rest of the milk if needed to make the icing the right consistency.

Put half of the icing into another bowl and colour it pale pink with the edible colouring. Carefully spoon this down one side of a piping bag fitted with a No. 8 star nozzle, then spoon the non-coloured icing down the other side of the bag. Twist the end of the bag to seal the icing in.

Pipe swirls of the icing on top of each cupcake. Scatter with the edible pink hearts, or other sprinkles, to decorate.

This recipe is from Mary Berrys Cookery Course ( published by DK, £25, dk.com ).

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