Preheat oven to 325° F. Line baking sheets with parchment.

Combine flour, cocoa, baking soda and salt in small bowl. Beat butter, granulated sugar, brown sugar and vanilla extract in large mixer bowl until creamy. Add eggs, one at a time, beating well after each addition. Gradually beat in flour mixture. Stir in morsels. Drop by well-rounded tablespoon onto parchment lined baking sheets.

Bake for 11 to 13 minutes or until cookies are puffed and centers are set. Cool on baking sheets for 2 minutes.

Remove to wire racks to cool completely.