Easy Fudge

1 1/2 cups sugar
2/3 cup evaporated milk
2 T. butter
1/4 tsp. salt
2 cups mini marshmallows
1 1/2 cups chocolate chips
1/2 c. chopped nuts (optional)
1 tsp. vanilla

Line 8 inch square pan with foil. Combine sugar, evaporated milk, butter and salt in medium heavy-duty saucepan. Bring to a full rolling boil over medium heat, stirring constantly. Boil, stirring constantly for 4 to 5 minutes. Remove from heat. Stir in marshmallows, morsels, nuts and vanilla extract. Stir vigorously for one minute or until marshmallows are melted. Pour into prepared baking pan. Refrigerate for 2 hours or until firm. Lift from pan, remove foil. Cut into 48 pieces.