Chocolate Marshmallow Fudge

1 spray cooking spray
1 2/3 c. sugar
2/3 c. fat-free evaporated milk
2 T. reduced calorie margarine or light butter
12 oz. semisweet chocolate, chopped (about 1 1/2 c.)
14 large marshmallow

8x8 inch pan with cooking spray.
In a medium saucepan, stir together sugar, evaporated milk and margarine; bring to a boil over high heat. Reduce heat to medium-low and cook, stirring constantly about 3 minutes.

Stir in chocolate and marshmallows; remove pan from heat and stir until smooth.

Pour mixture into prepared pan and refrigerate until firm, about 2 hours. Cut into thirty-six 1 1/3 in squares.