Pre-heat oven to 175 degrees celsius/350 degrees fahrenheit (fan-forced)
Cream the butter and sugar.
Add egg and vanilla essence and beat into creamed butter and sugar.
Add sifted SR flour and cocoa, peanuts, sultanas and peel. Mix well.
Roll heaped tablespoons (or use a cookie scoop to measure out portions) into balls and place on a tray lined with baking paper - leaving room for a little spreading.
Bake for 12-13 minutes.
Allow to cool then top with melted white chocolate, glace cherries and crushed pistachios (or your choice of topping).
Video
Notes
The clusters should last up to a few days stored in an airtight container.