In elementary school, I went to a parochial school.  They always had warm lunches, and this was one of my favorite desserts.  (I was also the champion milk spiller back in those days.)

1/2 C dark Karo or Pancake syrup
1 C brown sugar
1 C creamy peanut butter
4 C Puffed wheat cereal (Sugar Smacks)

In a double boiler, combine syrup and brown sugar.  Stir until soft ball stage is reached.  Combine with peanut butter and cereal.  Place in a 9 X 13 greased pan.  Spread out evenly .