1Preheat oven to 350 degrees F.
Combine flour, cocoa, baking soda and salt in a medium bowl. Beat butter, sugar, brown sugar and vanilla in a large mixing bowl until creamy. Beat in eggs. Gradually beat in flour mixture. Stir in chips or chunks. Drop by rounded tablespoons onto un-greased baking sheets.
Bake for 9 to 11 minutes or until cookies are puffed and centers are set but still soft. Cool on baking sheets for 2 minutes; remove to wire racks to cool completely.