In a saucepan stir together margarine, evaporated milk and sugar. Stirring constantly, bring to a boil. Continue stirring constantly, and reduce heat to low and cook approx 3 minutes.
Stir in marshmallows and chocolate. Remove from heat and stirring until smooth.
Pour into prepared 8x8 pan. Refrigerate until firm, approx 2 hours.
Cut into squares (36). Store in refrigerator for firmer fudge.
Notes
MyWW Points: Blue Plan 6 and Green Plan 56 WW Freestyle Points and 5 SmartPoints