EASY NEVER-FAIL FUDGE

I'm kind of picky about fudge.  It has to be creamy, not grainy or dry.  My sister-in-law, Lynn, gave me this recipe years ago and I think it's absolutely perfect.

 
In a 2-quart saucepan, combine:

1 cup margarine or butter
1 cup milk
4 cups sugar

Bring to a boil over medium heat, stirring frequently.  Boil for two minutes (keep stirring).  Remove from heat and pour the mixture over 25 large marshmallows (or 250 small ones if you're a glutton for punishment)!!  Stir with a wire whisk until smooth.  Add one package of milk chocolate chips and one package of semisweet chocolate chips.  Stir until smooth.  Add 1 cup chopped nuts, if desired.  Pour into a greased 9 x 13 pan and let cool.