Prepare the baking tray by lining it with baking paper or a silicone baking mat. This will make it easier to remove the chocolate once it has set.
Melt the chocolate gently in the microwave in short intervals, stirring between each one until smooth. Be careful not to overheat the chocolate, as this can cause it to become thick or grainy.
Pour the melted chocolate onto the prepared tray and spread it into an even layer, approximately 5mm thick.
Add the Halloween toppings while the chocolate is still soft. Sprinkle over the broken Oreos, candy corn, candy eyes, and Halloween sprinkles, gently pressing larger pieces into the chocolate so they stay in place.
If using coloured chocolate melts, drizzle them over the top before the bark sets for an extra festive finish. I also like to make my white chocolate into little ghostie shapes with a piping bag!
Place the tray in the fridge for about 1 hour, or until the chocolate is completely firm.
Once set, remove the chocolate bark from the tray and break it into pieces or cut into squares before serving.