HEAT oven to 350ºF.
STIR coffee grounds and water until blended; set aside. Combine flour, cocoa powder and baking soda. Beat butter and sugar in large bowl with mixer until light and fluffy. Add eggs and coffee; mix well. Gradually beat in flour mixture until blended. Add chocolate chunks and nuts; mix well.
DROP heaping tablespoonfuls of dough, 2 inches apart, onto baking sheets.
BAKE 11 to 12 min. or until centers are puffed. Cool on baking sheets 2 min.; remove to wire racks. Cool completely.