Before filling the molds with chocolate for the Hot Chocolate Bombs, the chocolate has to be melted. I prefer the double boiler method. Using this method helps ensure that the chocolate is not burned and the gently melted chocolate will be smooth and shiny. And, you don’t need any fancy kitchen gadgets to use this method.
To melt the chocolate chips, fill a pot about halfway full of water. Bring it to a simmer over low heat. Find a heat-safe bowl (glass or stainless steel) that can be set into the pot. Make sure the bottom of the spot is not touching the water. The steam is what will melt the chocolate chips.
Add the chocolate to the heat-safe bowl. With the heat on low, use a rubber spatula to stir the chocolate chips until they are melted and smooth. Use the chocolate to fill the molds. Don’t dump the pot of water, however. You will use a variation of this method again in a moment.
If you do use a microwave to melt the chocolate chips, melt them in 15-second increments, stirring in between. Be careful to not overdo this.
Filling the Molds
Fill each chocolate mold with a heaping spoonful of melted chocolate. Use the spoon to evenly spread out the chocolate into each mold. Place them in the freezer for about 10 minutes, or until the chocolate is set. Once set, gently remove the half-spheres of chocolate and place them on a parchment paper-lined baking sheet (or just a clean, flat surface).
Assembling Hot Chocolate Bombs
With the molds ready and the hot chocolate powder mixed, it’s time to get the bombs ready to go into a mug with hot milk! Fill each of three half-spheres with 2 tablespoons of hot chocolate powder and one tablespoons of mini marshmallows.
To seal the top halves of the molds onto the bottom halves, melt the rims of the top halves a bit. To do this, place the other three molds, seam-side down onto a baking sheet. Place the baking sheet over the pot of warm water over low heat. This will melt the rims just enough to acts as a seal.
Cover the filled halves of the chocolate molds with the top halves. I used gloves to make sure there were fewer fingerprints on the chocolate. Place a chocolate bomb into a mug. Slowly pour about 1 1/2 cups of hot milk over the bomb. The chocolate will start to melt and the hot chocolate mix and marshmallows will be set free to make a comforting cup of hot chocolate!