Mix all the ingredients together in your mixer until smooth and spoon into bun or muffin cases. Should make between 18 and 24 buns depending on the size of your cases.
Place in oven and bake for 20 mins. Leave to cool.
Mix the icing ingredients together until it forms a smooth paste. Add more lemon juice if it's too thick.
Add to one cupcake and quickly add your sprinkles before it sets. Repeat with the rest of the cupcakes.
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