Always mashed, either with melted butter on them or with gravy.
Get this...sometimes, I like to have PB&J with mashed potatoes with the butter.
Of course, I eat them in separate dishes, but I often eat them at the same time when I have this combination. This combination got started back when I was in school. Frequently at lunch, I would get a PB&J and, if mashed potatoes were being served, I would ask for those, too. The combination really got my taste buds dancing like crazy. Anyone else in the mood for PB&J with mashed potatoes?