White Chocolate Mud cupcakes

Ingredients:
4.5 oz butter, chopped
1 x 3.5 oz pkt good-quality white cooking chocolate, chopped
1 cup caster sugar
1/2 cup milk
1 egg, lightly whisked
3/4cup plain flour
1/2 cup self-raising flour
1 tsp vanilla bean paste
Silver cachous, to decorate
White chocolate ganache
2 x 6 oz pkts good-quality white cooking chocolate, chopped
1/2 cup thickened cream
2-3 drops pink liquid food colouring
Cooking time 35 minutes.
Directions:
Preheat oven to 325 F. Line twelve 1/3-cup capacity muffin pans with paper cases.
Combine the butter, chocolate, sugar and milk in a medium saucepan over low heat. Cook, stirring, for 5 minutes or until chocolate melts and mixture is smooth. Remove from heat. Transfer to a medium heatproof bowl and set aside for 5 minutes to cool slightly.
Use a balloon whisk to gently whisk in the egg. Sift the combined flours over the chocolate mixture and gently whisk until just combined. Stir in the vanilla bean paste. Pour mixture evenly among prepared muffin pans. Bake in preheated oven for 30 minutes or until a skewer inserted into the centres comes out clean. Turn onto a wire rack and set aside for 1 hour to cool completely.
Meanwhile, to make the white chocolate ganache, place the chocolate and cream in a medium heatproof bowl over a medium saucepan half-filled with simmering water (make sure the bowl doesn't touch the water). Use a metal spoon to stir occasionally until chocolate melts and mixture is smooth. Place in the fridge for 1 1/2 hours, stirring occasionally, or until ganache is spreadable. Add the pink food colouring and stir until well combined.
Use a round-bladed knife to spread cupcakes evenly with ganache. Sprinkle with cachous to decorate