Line a tray with baking paper.

Mix white chocolate with coconut oil then melt;
MICROWAVE: 
Use 50% power and 20 second intervals stirring between each.  Stop when 90% is melted then just stir until they all melt.

SAUCEPAN:
Place a bowl over a saucepan with about a centimetre of water.  Make sure no water splashes into the chocolate and keep it at a gentle simmer, stirring until 90% of the buttons have melted.  Remove from heat and continue stirring until all melted.

Add eyeballs to the ghosts.

To make the Mummies, use a fork to drizzle extra chocolate across the pretzel, then add the eyes.

Let set completely.