Cathedral Window Cookies
["1 (10 1/2 oz.) pkg. pastel miniature marshmallows", "1 c. chopped walnuts (optional)", "2 c. (12 oz.) semi-sweet chocolate chips", "1/2 c. butter or margarine"]
["Place marshmallows and nuts in a large bowl; set aside. In a saucepan, melt chocolate chips and butter over medium-low heat. Pour over marshmallow mixture and mix well. Cover and refrigerate for 1 hour, stirring occasionally. Shape marshmallow mixture into a 12-inch roll; wrap in wax paper. Refrigerate up to 4 hours or until firm. Unwrap and cut into 3/8-inch slices; cut slices in half. Yields 4 1/2 dozen."]
["pastel miniature marshmallows", "walnuts", "semi-sweet chocolate chips", "butter"]