Foolproof Fudge

This recipe is from my Mother in Law Lila, I have not tried it yet, but I want to put it in my blog before it gets lost....it's on a small square piece of paper that keeps falling off  the desk!!

FOOLPROOF FUDGE

3 C. (18 oz) semi sweet chocolate chips
14 oz can Sweetened Condensed Milk
dash of salt
1.5 t. Vanilla Extract
Optional:
1/2 C. Chopped Nuts
OR
2 C. minature Marshmallows

Line a 8 or 9 inch square pan with foil. Butter the foil. Set aside.

In a Heavy Saucepan melt the chips with the milk and salt
remove from heat. Stir in vanilla and the Nuts
or
2  Tablespoons of Butter and the marshmallows.

Spread evenly in prepared pan and chill for 2 hours or till firm.

Turn out onto a clean cutting board and peel off the foil.
Cut into squares.
Store covered in the refrigerator.