Break the chocolate into small pieces and place in a bowl, Microwave on medium power first for 1 minute, then for 20 seconds and then 10 second intervals until the chocolate has melted, target temperature is 32°C / 90°F.
Once melted gently mix in the corn flakes, rice crispies and mini marshmallows.
Place the 12 paper cake cases in a 12 cup muffin tin and fill each one with the mixture.
Decorate with your spooky sweets whichever way like.
Place the tray in the refrigerator for 30 minutes until the chocolate has set.