Pre-heat oven to 350. Melt chocolates, and butter on top of double boiler. Set aside to cool. In a separate bowl, beat eggs, sugar, coffee, and vanilla. Beat at high speed for 2 minutes. Add the cooled chocolate to the egg mixture. In a small bowl mix together the flour, baking powder, and salt. Add the flour mixture to the chocolate mixture. Stir in the chocolate chips. The mixture will be rather thick, so take your time, and combine well. Drop cookies on greased cookie sheet, and bake for 10-12 minutes, or until edges of cookies are hard.