PREHEAT oven to 375° F.
COMBINE flour, cocoa, baking soda and salt in medium bowl. Beat butter, brown sugar, granulated sugar and vanilla extract in large mixer bowl until creamy. Beat in eggs. Gradually beat in flour mixture. Stir in morsels, oats and nuts. Drop dough by rounded tablespoon onto ungreased baking sheets.
BAKE for 9 to 12 minutes or until edges are set but centers are still soft. Cool on baking sheets for 2 minutes; remove to wire racks to cool completely.
BAR COOKIE VARIATION:
PREHEAT oven to 350° F. Grease 15 x 10-inch jelly-roll pan. Prepare dough as above. Spread into prepared pan. Bake for 25 to 30 minutes. Cool in pan on wire rack. Makes about 4 dozen bars.