I do have a lost chocolate bar. In my childhood, they were marketed and packaged by Nabisco, chocolate covered with a peanut butter filling. They were called “Ideal Bars.” Even back then they were oddly hard to find, only occasionally appearing on supermarket store shelves. I think the last time I actually bought a package was in college. After that they vanished.
A Google search today brings up a protein bar. It’s not the same. It needs that old cheesy Nabisco packaging.