Take some extra butter and grease a 9x13-inch baking pan. Put the cereal
into a plastic bag and mash it slightly so that the pieces are slightly
broken but not made into a powder.
Combine the butter, chocolate chips, and corn syrup in a pan. Place it over
low heat and stir continuously until the butter and chocolate are melted and
the mixture is blended. Do not overheat while you are doing this. Remove
from the heat and add the vanilla. Stir in the powdered sugar (a whisk will
help you make it smooth).
Add the crushed cereal and stir in well until everything is mixed together
then, working quickly, scoop the mixture into the buttered pan and flatten
it and smooth the surface. Chill until firm. Cut into squares or rectangles
and wrap if you like.
