In the microwave or in a metal bowl over a pan of
simmering water, melt unsweetened chocolate, 1 cup
of the chocolate chips, and the butter stirring
occasionally until smooth. Remove from heat and
set aside to cool. In a large bowl, whip eggs and
sugar until thick and pale, about 2 minutes. Stir
in the vanilla and the chocolate mixture until
well mixed. Combine the flour, cocoa, baking
powder and salt; gradually stir into the chocolate
mixture. Fold in remaining 1 cup chocolate chips.
Cover dough and chill for at least an hour or
overnight.
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