Double Chocolate Brownies
["1 c. butter or margarine", "4 (1 oz. each) sq. unsweetened chocolate", "2 c. sugar", "4 eggs", "1 c. all-purpose flour", "2 tsp. vanilla", "1 c. pecans, coarsely chopped", "1 c. milk chocolate and/or semi-sweet chocolate pieces"]
["Preheat oven to 350\u00b0.", "Grease a 13 x 9-inch baking pan.", "In medium saucepan over low heat, heat butter and chocolate squares until melted.", "Remove saucepan from heat.", "Stir in sugar; add eggs one at a time, beating until blended.", "Stir in flour, vanilla and nuts.", "Pour into pan.", "Top with chocolate pieces.", "Bake 40 minutes or until wooden pick inserted in center comes out clean.", "Cool in pan on wire rack 30 minutes."]
["butter", "unsweetened chocolate", "sugar", "eggs", "flour", "vanilla", "pecans", "milk chocolate"]