PREHEAT oven to 325° F.
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 ungreased 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.
FOR MINI MINT CHOCOLATE DELIGHT COOKIES: Prepare dough as above. Drop by well-rounded measuring teaspoon onto ungreased baking sheets. Bake for 9 to 10 minutes or until cookies are puffed and centers are set. Makes about 7 dozen mini cookies.