Place 2 cups chocolate chips in a microwave safe bowl, heat on 50% power in the microwave for 3-5 minutes, stirring every 30 seconds until melted.
Use a teaspoon to scoop the chocolate into the half circles on the silicone mold, one at a time. Spread the chocolate evenly onto the sides and bottom of mold until completely coated in melted chocolate. Do the same to all 12 half circles.
Place the silicone molds into the freezer for 2-3 minutes and remove.
Add a second layer of melted chocolate to the half circles molds, especially on the edges.
Freeze again for another minute and remove carefully with food safe gloves.
Carefully stretch the silicone molds to remove the half circles.
Turn the mold upside down and place the rounded sides in between the molds as a stand while filling.
Add 1 tablespoon hot cocoa powder, the mini marshmallows and colorful sprinkles to the one side.
Reheat the chocolate if it has hardened and add 4 tablespoons to a decorating bag.
Cut a small tip off the decorating bag and frost the edge of one half chocolate circle. Carefully and quickly add an empty chocolate circle on top to make a sphere and hold it in place for 15 seconds or until the chocolate has acted like glue and hardened.
Place onto a plate, drizzle melted chocolate on top with the decorating bag, and top with colorful sprinkles.
Let the chocolate harden and place in a glass of warm/hot milk, stir, and watch the bomb melt to see what’s inside or place in an empty glass and pour hot milk on top of the bomb, watching it melt, and then stir.