Melt 1 cup of the chocolate chips with the butter in the top of a
double boiler until smooth. Remove from the heat, and let it cool to
room temperature.
Preheat the oven to 325F. Line cookie sheet pans with parchment
paper and set aside.
To make the batter, combine the flour, cocoa, salt, and baking
powder in a small bowl, and set aside. In a large bowl, beat the
eggs, sugar, and vanilla until thick and light yellow, about 2
minutes.
Stir in the flour mixture and cooled chocolate, and beat for 1
minute. Fold in the remaining 1 cup chocolate chips, the
marshmallows, and the nuts, if using.
Drop a tablespoon of batter onto the prepared cookie sheet pans
about 2 inches apart. Bake for approximately 10 minutes, or until
just firm.
Remove from the oven, transfer to a wire rack, and cool for 5
minutes before removing from the cookie sheet pans.
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