If you don’t have an Instant Pot, you can melt the candy melts in the microwave. Microwave at 30 second intervals, stirring the chocolate in between each interval, until the chocolate is full melted.
Lightly grease the inside of your silicone molds. Add chocolate to your mold, making sure that chocolate is completely coating the mold on the inside. Place in the freezer for ten minutes.
Add more melted chocolate on top of the marshmallows to close the mold and lock the cocoa and marshmallows from coming out. Return to the freezer for 10 minutes.