Doubly Chocolate Cookies
["1 c. (2 sticks) margarine, softened", "1 1/2 c. sugar", "2 eggs", "2 tsp. vanilla extract", "2 c. all-purpose flour", "2/3 c. cocoa", "3/4 tsp. baking soda", "1/4 tsp. salt", "2 c. (12 oz.) semi-sweet chocolate chips", "1/2 c. coarsely chopped nuts (optional)"]
["Heat oven to 350\u00b0.", "In large mixer bowl beat margarine, sugar, eggs and vanilla until light and fluffy.", "Stir together flour, cocoa, baking soda and salt.", "Add to sugar mixture.", "Stir in chocolate chips and nuts, if desired.", "Drop by rounded teaspoonfuls onto ungreased cookie sheet.", "Bake 8 to 10 minutes or just until set.", "Cool slightly.", "Remove from cookie sheet to wire rack.", "Cool completely.", "Yields about 4 dozen cookies."]
["margarine", "sugar", "eggs", "vanilla extract", "flour", "cocoa", "baking soda", "salt", "semi-sweet chocolate chips", "nuts"]