An American friend (thanks Judy!) told me about Roscioli Il Forno, describing it as "among Rome's many food temples to visit" while... well, visiting. It's actually two different places a quarter block apart in Rome's neighborhood known as Campo de' Fiori. It consists of a wine salumeria restaurant and then a bakery (or "forno" ).
Judy's suggestion paid off with eye candy and tasty splendor. Despite typical Roman service - that can come off as rude or indifferent - if you're in Rome, try it. More precisely, try a pizza bianca with mortadella. Or order a savory porchetta sandwich. Then get a caffé across the way, and maybe even a cornetto. Here's a peek!