Preheat oven to 180ºC F. Cream butter. Add both sugars and beat well. Add egg and mix well. Add flour, coffee powder, baking powder, salt, cinnamon, vanilla, and half cup walnuts. Mix well. Wrap dough in wax paper and chill thouroughly in refrigerator (at least two hours). Remove dough from refrigerator. Using rounded teaspoonfuls of dough, shape into balls using palms of hands and place 5 cm apart on an ungreased cookie sheet. Bake 12-15 minutes. Remove cookie sheet from oven and working quickly place 3-4 chocolate chips in the center of each hot cookie. When chocolate has softened, spread over top and sprinkle with balance of walnuts. Remove to wire rack and cool. ----