Chewy Chocolate Cookies
["1 1/4 c. butter or margarine", "2 c. sugar", "2 eggs", "2 tsp. vanilla", "2 c. all-purpose flour", "3/4 c. Hershey's cocoa", "1 tsp. baking soda", "1/2 tsp. salt", "1 (10 oz.) bag Reese's peanut butter chips"]
["Heat oven to 350\u00b0.", "Mix butter and sugar until light and fluffy.", "Add eggs and vanilla; beat well.", "Stir together dry ingredients and chips last.", "Drop by teaspoon onto ungreased cookie sheet for 7 to 8 minutes.", "Do not overbake.", "Leave on cookie sheet until cold."]
["butter", "sugar", "eggs", "vanilla", "flour", "cocoa", "baking soda", "salt", "butter chips"]