Set the plate into the freezer.
Set a large Melt candy according to package directions.
Add a spoonful of melted candy to each of the mold cavities, then use a spoon to spread it, making sure to coat the entire cavity. Up the sides. Transfer leftover melted candy to a ziplock baggie.
Set the candy filled molds in the freezer for 5 minutes, remove, and then repeat the step above.
Heat a small frying pan over low-medium heat.
Remove the plate and candy filled molds from the freezer, and carefully remove the candy semi-spheres from the mold. Set upside down onto the chilled plate.
Grab one semi-sphere and hold it hollow side down, then gently touch it to the hot pan to melt a thin layer of the candy coating.
Flip the candy semi-sphere over, and fill with 1 tbsp of cocoa mix, a pinch of crushed peppermint, and 3-4 marshmallows.
Repeat step 8, then set that one upside down onto the one that you just filled.
If the ziplock baggie of candy is not still melted, heat for about 10-15 seconds, massage the baggie, then snip off the very corner of the bag, and drizzle candy in a circular motion on top of each ciao bomb, then top with crushed peppermint candies.
To enjoy, drop cocoa bomb into 6 oz of very hot milk or water, and stir.