The crescia sfogliata is the layered one, and that single word, sfogliata, meaning leafed or sheeted, is what separates it from every other griddle bread in central Italy. The dough is enriched, often with egg and a generous quantity of lard or oil and a heavy hit of black pepper, then rolled, greased, folded, and rolled again so that it builds internal sheets the way a rough puff pastry does. Cooked on the flat testo, the Urbino griddle stone, it does not bake into a single dense crumb. It puffs and separates into flaky strata, crisp where the fat met the heat and tender between the leaves. That structure is the defining fact: a crescia sfogliata split open shows layers, not a uniform interior, and it is built to be torn along them.
The craft is the lamination and the stone. The fat has to be worked through the folds evenly or the bread bakes patchy rather than leafed, and the testo has to be hot enough to set the outside while the interior sheets steam apart. Split warm and folded around a filling, the bread does a particular thing a flat unleavened round cannot: the flaky layers shatter slightly at the first bite and then give, so a cured meat or a wilted green reads against texture as much as against flavour. The pepper in the dough is structural to the taste, not a garnish, which is why a good crescia sfogliata needs very little inside it to feel complete.
Because the bread is the achievement here, the named fillings are treated as their own preparations rather than crowded into this one. The same layered round split around prosciutto crudo and rocket is the Crescia con Prosciutto e Rucola; split around sausage and wilted spinach it is the Crescia con Salsiccia e Spinaci. Each of those is this same Urbino flatbread meeting a distinct filling, and each deserves its own article rather than being crowded in here.