Chocolate Sheet Cake Brownies
["2 c. flour", "2 1/2 c. sugar", "2 sticks butter", "4 heaping Tbsp. cocoa", "1 c. water", "1/2 c. buttermilk", "1 tsp. vanilla", "2 eggs, slightly beaten", "1 tsp. baking soda", "1 to 2 c. chopped walnuts", "1 (12 oz.) pkg. Reese's peanut butter chips (optional)"]
["Mix flour, sugar and baking soda together; set aside.", "Mix together in a saucepan the butter, cocoa and water; bring to a boil.", "Pour this mixture over dry ingredients; mix well.", "Add buttermilk, vanilla, slightly beaten eggs, chopped walnuts and, if desired, Reese's peanut butter chips.", "Mix altogether well.", "Pour into greased flat 11 x 16-inch cookie sheet or 9 x 13-inch cake pan.", "Bake at 400\u00b0 for 20 minutes.", "Frost while cake is hot."]
["flour", "sugar", "butter", "cocoa", "water", "buttermilk", "vanilla", "eggs", "baking soda", "walnuts", "butter chips"]