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1
Preheat oven to 350F and grease 2 large heavy baking sheets.
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2
In a double boiler or a metal bowl set over a saucepan of barely simmering water melt unsweetened chocolate, 1 cup chocolate chips, and butter, stirring until smooth, and remove top of double boiler or bowl from heat.
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3
In a bowl with an electric mixer beat eggs, sugar, and ground coffee on high speed until very thick and pale and mixture forms a ribbon when beaters are lifted, about 3 minutes, and beat in chocolate mixture.
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4
Into mixture sift in flour, baking powder, and salt and stir until just combined.
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5
Stir in remaining chocolate chips and walnuts.
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6
Drop batter by heaping tablespoons about 2 inches apart onto baking sheets and bake in batched in middle of oven 8 to 10 minutes, or until puffed and cracked on top.
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7
Cool cookies in baking sheets 1 minute and transfer to racks to cool completely.
