2 c. sugar
2/3 c. evaporated milk
16 lg. marshmallows
1/4 tsp. salt
1/4 c. butter
1 (6 oz.) pkg. semi-sweet chocolate pieces
1 tsp. vanilla

Combine sugar, evaporated milk, marshmallows and salt in pan. Cook and stir over medium heat for 5 minutes, stirring constantly. Remove from heat and beat in butter, chocolate pieces and vanilla. Beat until chocolate melts and spread into a buttered 9 inch square pan. Chill until hard and keep refrigerated. 64 squares.