Merope 2 perhaps? Posted one about that just recently myself. Either the biggest monolith ever or a glitch.
HOWEVER, I like the chocolate idea better. The object might have been left there from the planet Chololatia in the Hershey star system. I understand there may be a rectangular object orbiting over their home world that looks like a giant Mars bar. Their orbiting platform looks like a large Oreo cookie.
Well, at least, that's what I heard from some guy claiming to be from the Ford Galaxy.