In medium saucepan, combine brown
sugar, milk, corn syrup, and butter. Cook and stir over medium heat till
sugar dissolves and butter melts; remove from heat. Add peanut butter; beat smooth with
rotary beater; cool.
In parfait glasses, alternate layers
of vanilla ice cream and peanut butter sauce, beginning and ending
with ice cream. Garnish parfaits with peanuts or
crushed peanut brittle, if desired.
