Can't Fail Fudge

4 c Miniature marshmallows

2/3 c Evaporated milk

1/4 c Butter or margarine

1 1/2 c Sugar

1/4 ts Salt

12 oz Semisweet chocolate pieces

1 ts Vanilla

1/2 c Chopped nuts

Combine marshmallows, milk, butter, sugar and salt in saucepan. Cook and stir until mixture comes to full boil. Boil 5 minutes over medium heat, stirring constantly. Remove from heat and add chocolate pieces, beating until melted. Do not overbeat. Fold in vanilla and nuts. Pour into greased 9-inch square pan. Chill until firm. Makes 2 1/2 pounds