Preheat the oven to 180℃/160℃Fan/350℉/Gas 4 and line a muffin tin with 12 muffin cases.
Put all the sponge mixture ingredients in a mixer or bowl and mix until smooth and evenly mixed.
Divide the mixture among the paper cases and bake for 20-25 minutes until well risen and light golden brown. Transfer to a wire rack and leave to cool.
Buttercream Icing/Frosting
Put the butter and half of the icing sugar into a bowl, and beat with an electric mixer until smooth. Add the vanilla extract and milk, and the remaining icing sugar. Beat again until light and fluffy.
Place half of the mixture into another bowl and add a few drops of pink colouring. Mix together. In the other bowl add some poppy or chia seeds if using.
Spoon the pink and non-coloured icings down opposite sides of a piping bag fitted with a plain or star nozzle. Then just twist the end of the bag to seal in the magic.
Pipe swirls on top of each cupcake.
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