I think you might be referring to the snack with 1/2 an apple filled with a "Green Mountain Truffle." If that's the snack, it is more than just peanut butter. We will likely put that recipe in our cookbook or on the website soon, but just to give you the quick and dirty version it's a combination of:
Equal amounts of these 3 ingredients: natural peanut butter powered skim milk whole Cheerios for some crunch