Step 1

Preheat oven to 180°C. Line eighteen 90ml-capacity muffin pans with paper cases.

Step 2

Sift the flour, cocoa powder and baking powder into a large bowl. Stir in the sugar. Make a well in the centre. Combine the egg and yoghurt in a bowl. Add the yoghurt mixture and butter to flour mixture and stir until just combined. Divide mixture among the prepared pans and smooth the surfaces. Bake for 15-20 minutes or until a skewer inserted into the centres comes out clean. Transfer to a wire rack to cool completely.

Step 3

To make the icing, use an electric beater to beat the butter until pale. Gradually add the icing sugar and beat until combined. Stir in the melted chocolate.

Step 4

Spread the icing over the cupcakes. Top with Cadbury Favourites.