Preheat oven to 180 degrees C. Line 12 x 1/3-cup/80ml-capacity, muffin pan holes with paper cases.
Combine the butter, sugar, milk and chocolate melts in a medium saucepan. Stir over low heat until smooth. Pour into a large bowl. Cool for 10 minutes.
Whisk egg into chocolate mixture. Whisk flour into chocolate mixture until smooth. Spoon mixture into paper cases. Bake for 20-25 minutes or until cooked when tested with a skewer. Cool on a wire rack.

Make the white chocolate buttercream
Using an electric mixer, beat butter for 3-4 minutes or until almost white. Gradually beat in the icing sugar then the milk until smooth. Beat in the cooled melted chocolate. Spread or pipe buttercream on cupcakes. Decorate with cachous.
Ingredients
Makes: 12
- 125g butter, softened
- 2/3 cup (150g) caster sugar
- 1/2 cup (125ml) milk
- 150g white chocolate melts
- 2 eggs, lightly beaten
- 1 2/3 cups (250g) self-raising flour
- 1/3 cup rainbow coloured cachous
- White chocolate buttercream
- 125g butter, softened
- 1 1/2 cups (240g) soft icing sugar
- 2 tablespoons milk
- 75g white chocolate melts, melted, cooled slightly
