Oven to 350 degrees. Beat butter, sugar, eggs adn vanilla with electric mixer on med speed in large bowl until light and fluffy. Stir together flour, cocoa, baking soda and salt; add to butter mixture, beating until well blended. Stir in chocolates and nuts, if desired. Drop by tablespoons onto ungreased cookie sheet. Bake 8-10 minutes or just until set. Cool slightly. Remove to wire rack and cool completely.
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