Sandwiches de miga are prepared with crustless white bread, and they can consist of two or more bread slices per sandwich. It is believed that they developed under strong European influences, primarily British and Italian. The most common variety of the sandwich is made with mayonnaise, cheese, and ham, but there are no restrictions concerning the possible fillings.

Although sandwiches de miga are usually consumed as an afternoon snack, they are also a staple at parties, celebrations, or family gatherings. A common variety is called a tostado – a toasted sandwich de miga that is traditionally served warm.

It is believed that sandwiches de miga were created around 1900 in the Confitería Ideal in Buenos Aires, where British businessmen used to meet and eat these crustless sandwiches that reminded them of their home.