Mustacciuoli, also known as mustaccioli or mostaccioli, is a pastry originating in the Naples region of Italy, usually served at Christmas time.

Mustaccioli takes the form of a parallelogram, and consist of a soft, spiced, cake-like interior, covered in chocolate.

[1][2] Mustaccioli are often sold alongside other Neapolitan sweets including roccocò, raffiuoli, susamielli, and struffoli at Christmas time.

Neapolitan mostaccioli were mentioned by Bartolomeo Scappi, personal cook of Pope Pius V as part of his pranzo alli XVIII di ottobre (October 18 lunch).

Originally, the mustaceum was a wedding cake, wrapped in bay leaves that gave aroma during cooking.