Melt the chocolate in a microwave oven at 60 percent power in one-minute bursts, stirring it and nuking it and stirring it again a minute at a time until it melts completely and becomes smooth and pourable.
Pour about half of the chocolate into a pan or baking dish lined with waxed paper at the bottom. Sprinkle the marshmallows and nuts over the chocolate. Cover it all with the rest of the chocolate.
Let it cool and harden. To serve, just break into pieces.
