Place 5 ounces of the chocolate in a medium bowl microwave safe bowl and microwave for 30 seconds, remove and stir. Then microwave at 15-second intervals, stirring completely and scraping the sides of the bowl with a rubber spatula between each one, until almost completely melted.
Continue to stir so that the heat of the chocolate melts the unmelted pieces. Check the temperature to make sure that the chocolate is between 88 and 90°F. If it goes over 90 degrees, stir in an additional ounce of chocolate until melted to bring it back down to 88 to 90 degrees. If you are using two molds, you can do 10 ounces then add in 2 ounces, if needed.
You don’t want that chocolate to sit too long and have to be reheated again if you only have one mold. If you do not temper the chocolate with a thermometer and this process, the chocolate can turn out chalky or discolored instead of shiny.
Spoon about 1 tablespoon of melted chocolate into each mold and use the back of the spoon to spread it around evenly, make sure to get all the way to the top of the rim and not leave any uncoated areas. Place the mold on the small baking sheet and refrigerate for 5 minutes.
Remove from the refrigerator and spoon another heaping spoonful into the molds one at a time (do not add chocolate to each cavity at once because it will start to cool too quickly and become thick, gritty, and hard to work with). Use the back of the spoon to work the second layer of chocolate around making sure to build up the edges around the rim, you want a thicker edge to ensure they don’t crack. Freeze for 10 minutes.
Remove the molds from the freezer and put on the food-safe gloves. Remove the chocolate shells from the molds. Repeat steps 1 - 4 if using a single mold.
Once all of your shells are made, microwave a flat plate in the microwave for 2 minutes, then place 6 of the 12 halves on the plate one at a time using a gloved hand to gently spin them to smooth the edges then place round side down in a regular-sized cupcake liner on your work surface. Wipe off the plate.
Fill the cavities with a packet of hot cocoa mix and marshmallows.
Reheat the plate for 2 minutes in the microwave. Then repeat the process with the other 6 halves and place them on top of the cocoa filled halves and gently press to seal.
Let the hot chocolate bombs set for a few minutes then top with a drizzle of chocolate and sprinkles, if desired.
To serve the hot chocolate bombs, heat the milk in a small saucepan over medium heat just until the edges begin to bubble the remove and pour over a hot chocolate bomb in a large mug and stir until fully mixed.
Notes
About the chocolateI tested this recipe with several kinds of chocolate and ONLY recommend using a bar of high-quality chocolate or couverture chocolate. Melting wafers and chocolate chips have additions to them that make them less than ideal for this type of recipe. And candy melts ARE NOT CHOCOLATE, and even the chocolate flavored ones just have cocoa powder added and not cocoa butter, which is what we want.You want to use a chocolate that’s between 55% and 80% cocoa for this recipe and it needs to have cocoa butter as one of the first ingredients.If using chocolate bars, you want them to be super finely chopped, you could even put them in a food processor or blender. You want the pieces to be small so that they melt quicker and more evenly.If using milk chocolate, you’ll want to heat the chocolate to be between 86 and 88° F. If using white chocolate, you’ll want it to be between 82 and 84°F.If after melting and trying to stir in any remaining chocolate they just don’t want to melt, microwave for an additional 5 seconds.To test if your chocolate is tempered or not, you can smear a bit on a piece of parchment paper and place it in the refrigerator for a few minutes. If it’s shiny and snaps in half when you take it out then your chocolate is tempered, if it bends then it’s not.About the raspberry hot chocolateThe raspberry hot chocolate mix is easily found at most major grocers, I’ve also included a link to Amazon.A lot of recipes call for 2 teaspoons to 1 tablespoon of hot chocolate powder. This seems crazy low to me given that most hot chocolate packages call for 6 ounces of milk. However, I understand that you also need to account for the chocolate in the shell and that’s why I recommend 8 ounces for best results. I used six (6) 1-ounce packets, and the powder measures at 2 tablespoons per pack. 12 tablespoons = 3/4 cup dry cocoa mix.Other Notes
You can use a brush to paint the chocolate into the molds, this definitely gives you more control but I found that you need an extra layer because the layers are so thin which means more prep time. I much preferred using a small rounded spoon.
Another option for sealing the molds is to pipe a thin line of chocolate around the rim of the filled cup and then top with the other half and roll the melted chocolate in sprinkles. But I much preferred the look of the plate method.
Gloves can help not leave fingerprints on the spheres, however, be sure not to grab the hot plate with your gloved hand and then touch the spheres or it will leave a mark.
These are best consumed right after making or within 24 hours.
Silicone molds have a tendency to attract lint, so I would avoid drying them with a dishcloth. Instead, let them air dry or pat with a paper towel.
Acrylic molds can also be used but I have not tested the recipe with them.
I shared a link above of the mold set I used, I used the large mold and they measure 2.75 inches across - the amount of chocolate needed will vary based on mold size, but I think the amount called for should work for 2.5-3 inches.If someone just wants to make a set of 3, then 6 ounces of chocolate should be enough and if they want to do more, just add 6 ounces of chocolate for every set of 3.
If you are using couverture you will definitely want to use a food scale to measure it, if you are using bars of baking chocolate then it’s a little bit easier to measure since the bars are usually in blocks that can be easily broken off and weigh .5 - 1 ounce each.