Put the white chocolate melts into a microwave container, like this pyrex measuring cup. Microwave on high 30 seconds then stir, repeat this process in 30 second intervals until chocolate is smooth. (It took one minute and thirty seconds in my microwave).

Add a small amount of melted white chocolate to each cavity of your sphere silicone mold. Use the back of a spoon to spread it all the way around the mold.

Place the mold in the refrigerator for 15 minutes and allow the chocolate to set. Remove it from the refrigerator and repeat the process adding one more layer of chocolate (remember to reserve some of the melted chocolate for drizzling at the end). Place in the refrigerator another 10-15 minutes until set.

Take three of the half spheres and evenly distribute the white hot chocolate mix and marshmallows among them.

Heat a plate in the microwave for about 1 minute. Take the three half spheres that haven't been filled and melt the edge on the plate. Place each one on top of the filled halves. Gently press down to seal.

Take the leftover melted white chocolate and drizzle it on your spheres. Sprinkle on the sprinkles before the chocolate sets so they adhere to it.

Store the hot chocolate bombs in an airtight container in a cool place away from direct sunlight.

When ready to use them, add a sphere to a mug with 1 - 1.5 cups warm milk. Stir until the chocolate is melted and the mix is well combined with the milk. Enjoy!