Melt the dark green melting chocolates in a microwave safe bowl in one minute increments, stirring each time between cooking, until the chocolate is melted smooth.
Place the molds onto a baking sheet.
Use a spoon to pour a spoonful of the mixture into the hot chocolate bomb molds. Use the spoon to spread it all the way to the top of the molds and to even the chocolate out.
Place the baking sheet into the freezer for 10 minutes, or until firm, or in the fridge for 30 minutes, or until firm.
After they’ve firmed, remove the green halves from the molds.
To even up the edges of the half circles, microwave a glass plate and gently spin the edges of half of the halves you made on the plate until smooth.
Fill one green half with a single packet of hot chocolate (or two tablespoons), and a pinch of green sprinkles.
When half of your halves are filled, then you can add the tops to seal them. Microwave the plate again, then spin the unfilled half on the plate, and gently press it onto the filled half.
Once all your spheres are made, you’re ready to decorate your hot cocoa bombs! Melt a small handful of your light green chocolates a minute at a time, stirring in between, until smooth.
Pour the melted chocolates into the corner of a small plastic baggie. Cut a tiny edge off the corner of the baggie, and then use the baggie as a piping bag to pipe stripes of light green chocolate over the tops of your hot cocoa bombs.
To finish them off, use a tiny dot of the melted light green chocolate to attach one red heart sprinkle onto the top of the Grinch hot chocolate bomb.
Place your hot chocolate bombs into cute cupcake liners, and then into cellophane bags for giving. Use a twist tie to seal the cellophane bag, and then attach the Grinch Hot Chocolate Bombs printable instruction tags using a hole punch and curling ribbon.
To heat and serve, place the hot cocoa bomb in a mug, and pour over 8 ounces, or one cup, of very hot (not boiling) milk and stir until the contents have dissolved. Add another heart sprinkle on top of the cup of green hot chocolate if the first dissolved, for the perfect cup of Grinch hot chocolate.