Maida Heatter has a brownie recipe that includes York peppermint patties. You put half the batter into the pan, then lay the mints wall to wall across the pan, then spread the rest of the batter on top. They are something yummy! I usually make them sometime after Christmas when the red and green wrapped mints go half-price. I think bits of chocolates would work for your cookies too, although you might have more success in bar form (bar cookies I mean, if that makes sense). Things might get a little bit chewy and gloppy, which is all good.
