Reese'S Chewy Chocolate Pan Cookies
["1 1/4 c. butter", "2 c. sugar", "2 eggs", "2 tsp. vanilla extract", "2 c. all-purpose flour", "3/4 c. cocoa", "1 tsp. baking soda", "1/2 tsp. salt", "2 c. (12 oz.) Reese's peanut butter chips"]
["Heat oven to 350\u00b0.", "Grease 15 1/2 x 10 1/2 x 1-inch jelly roll pan.", "In large mixer bowl, beat butter and sugar until light and fluffy.", "Add eggs and vanilla; beat well.", "Combine flour, cocoa, baking soda and salt.", "Gradually blend into creamed mixture.", "Stir in chips."]
["butter", "sugar", "eggs", "vanilla extract", "flour", "cocoa", "baking soda", "salt", "butter chips"]