This is a central PA specialty, as is Grapenut ice cream. I think it's an Amish thing. But it's certainly a delicious thing. And really really easy.
2 small or 1 large containers of whipped topping (regular or light)
2 small or 1 large box of vanilla instant pudding
3 cups milk
1 cup Grapenuts cereal
Take one cup of milk and add it to the Grapenuts and let them soak for 10 minutes. Using the other 2 cups of milk, mix with the instant pudding. Fold in whipped topping and mix in Grapenuts. And you're done!
I advise letting it set up for about an hour.
Seriously, I dare you to try it. And them come back and tell me how awesome I am for giving you this recipe.