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In a large saucepan over low heat, melt the unsweetened chocolate, 1 cup of the chocolate chips, vanilla, and butter together; stirring, until smooth.
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Remove pan from heat; cool for 10 minutes.
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In a large bowl, beat the eggs and sugar together for 2 minutes with an electric mixer on medium speed.
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Beat in the vanilla and chocolate mixture.
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Combine the flour, cocoa powder, baking powder, and salt; add to the chocolate mixture just until combined.
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Stir in the remaining chocolate chips.
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Cover dough and chill for at least 3 hours.
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Remove about 1 cup of the dough from the refrigerator; with lightly floured hands, roll into 1" balls.
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Place 2" apart on ungreased or parchment paper-lined cookie sheets.
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Bake in a preheated 350*F.
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oven for 10-12 minutes, or until lightly puffed and set.
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Cool for 3-4 minutes on the cookie sheets before removing to a wire rack; cool completely.
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Dust with powdered sugar.