In a small, microwave safe bowl, melt white chocolate chips first for 30 seconds and stir well. Microwave for another 30 seconds and stir again. Microwave for 15 seconds and stir. If necessary, melt for an additional 15 seconds and stir again. White chocolate should be melted and smooth. Evenly divide the melted white chocolate into the 8 heart molds and using the back of a spoon, spread around to coat the sides, making sure that the top edges are well coated to prevent fragility. Let set in the fridge or freezer for about 10 minutes or until hardened. Carefully remove each heart from the molds and place on a plate.
In a separate, small, microwave safe bowl, melt the pink candy melts in 30 second increments, stirring in between. This should take 30-60 seconds. Spoon into a small baggie or piping bag and cut a small hole in one tip. Drizzle one half of a heart then immediately sprinkle a few sugar pearls and sprinkles over the candy melt before it hardens. Using the same method, repeat with 3 more hearts. Let set until hardened.
Spoon 1 Tbs of the Nesquik strawberry milk mix into the 4 remaining, plain hearts. Top with several mini marshmallows but not too many as they will make it difficult to seal the completed cocoa bombs.
Warm a small plate in the microwave for 45 seconds. Place a decorated heart onto the plate for a few seconds so that the edges begin to melt a little bit. Once the edges have slightly melted, place it onto the coordinating filled half shell. Run a clean finger around the edge to smooth it. Repeat with the remaining 3 hearts until the cocoa bombs are all completed. Serve and enjoy!
To make hot cocoa simply place a cocoa bomb in the bottom of a mug and pour 6 oz of warm milk or water over it. Once the shell has melted, stir the cocoa and white chocolate to emulsify and enjoy.