Melt the white chocolate according to package instructions in a microwave-safe bowl.
Distribute a small spoonful of melted chocolate into each mold cavity, ensuring the entire cavity is coated.
Freeze the mold for 5 minutes.
Apply a second coat of chocolate following the same method as before.
Freeze the mold again for 5 minutes.
Warm a small glass plate in the microwave for 2 minutes.
Take the hollow chocolate spheres from the mold and place them on the chilled plate.
Melt the edges of one sphere on the warmed plate, fill with a tablespoon of cocoa mix, then melt the edge of another sphere and join them together to form a cocoa bomb.
Melt blue candy melts in a baggie in the microwave for 30 seconds, then knead the bag. If necessary, heat for another 10-20 seconds until fully melted.
Snip the corner of the baggie and dribble melted candy over the outer shell of the assembled cocoa bombs.
Embellish with galaxy sprinkle mix and allow to set completely.
To enjoy, place a cocoa bomb in a mug and gradually pour 8 ounces of warm milk over it, stirring until fully dissolved.
Notes
Ensure that your candy melts have completely hardened before removing them from the mold.
Spooning the melted chocolate around the mold helps to ensure that you get a completely covered outer layer of white. Use a pastry brush if needed.
Don’t overheat the candy melts in the microwave, and try to avoid microwaving for more than two minutes at a time; otherwise, the melting chocolate will become too liquidy and harden too quickly.
If you find that the cocoa bomb is smudging from the heat of your fingers, then wear gloves.