2 c. (12 oz. pkg.) semi - sweet chocolate chips
1/4 c. butter
2 tbsp. shortening
6 c. (10 1/2 oz. bag) mini marshmallows
1/2 c. chopped nuts

Place chocolate chips, butter and shortening in large micro - proof bowl. Microwave at medium speed (50%) for 5 to 7 minutes or until chips are softened and mixture is melted and smooth when stirred. Add marshmallows and nuts; blend well. Spread evenly in buttered 8 inch square pan. Cover; chill until firm. Cut into 2 inch squares.