Grab your large microwave-safe mixing bowl and toss in your marshmallows and butter. Pop it in the microwave for 1-2 minutes until the marshmallows get puffy and the butter is melted.
Grab your smaller microwave-safe bowl and heat the chocolate candy pieces in the microwave for 3-4 minutes on 50% power. Take it out every 30 seconds to stir until it is fully melted.