#1 In the microwave, melt 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 for 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. #2 Preheat oven to 350°F. Roll chilled dough into 1 inch balls. Place on ungreased cookie sheets. #3 Bake for 9 to 11 minutes in the preheated oven. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.