Cut the chocolate bark in half and put it in a microwavable bowl.
Microwave for about 2 minutes then stir until the chocolate melts
Spread the chocolate in the mold. Put it in the fridge for about 2-3 minutes.
Take the mold out and add another layer of chocolate, especially on the top edges.
Put it in the fridge again until hardens.
Once the chocolate is hard, gently take it out of the mold.
Heat a nonstick pan on low.
Take one side of the chocolate dome and put it in the pan for 2 seconds to melt the edges.
Remove and add the hot cocoa powder and mini marshmallows.
Take the other side of the chocolate dome and melt the edges.
Then put it on top of the other one to close and seal the cocoa bomb.
Drizzle melted chocolate on top and add sprinkles of choice
Repeat until all is done