Preheat oven to 180ºC . Butter and grease two large cookie sheets. Melt butter and unsweetened chocolate Stir in 1 cup of chocolate chips. When chips are almost melted, remove mixture from the heat. Mix eggs, coffee crystals, vanilla and sugar until smooth. Stir into the chocolate mixture. Mix dry ingredients (flour, baking powder, salt) and stir into the chocolate mixture. Add nuts and remaining chocolate chips. Stir well. Drop quarter cup of batter onto prepared baking sheet. Place cookies about 1- half inch apart.
Bake for 13 15 minutes or until the tops look "crusty and crackling but the insides are still "moist". Let stand on baking sheet for 3 4 minutes, then place onto a wire rack to cool completely. Store in an airtight container. Makes 18 cookies.