Hershey'S Doubly Chocolate Cookies
["1 c. (2 sticks) butter, softened", "1 1/2 c. sugar", "2 eggs", "2 tsp. vanilla", "2 c. flour", "2/3 c. Hershey's cocoa", "3/4 tsp. baking soda", "1/4 tsp. salt (optional)", "2 c. chocolate chips"]
["Preheat oven to 350\u00b0.", "Beat the butter, sugar, eggs and vanilla.", "Stir (in separate bowl) the flour, cocoa, baking soda and salt.", "Add this mixture to the butter-sugar mixture.", "Stir in chocolate chips.", "Spoon-drop onto ungreased cookie sheet.", "Bake for 8 to 10 minutes."]
["butter", "sugar", "eggs", "vanilla", "flour", "cocoa", "baking soda", "salt", "chocolate chips"]