"Banh Pia" is well known cake in the South of Vietnam, In fact, "Banh Pia" is a version of Teochew Mooncake (and quite similar to Suzhou mooncake), however, it is not considered moon cake in Vietnam, they are sold all year round not only on Mid-Autumn festival. I guess because it’s tasty so people can wait to eat it once a year 
 
"Banh Pia" has many paper thin and soft layers of crust which are easily be peeled off when we touch it. A traditional filling is mung bean paste and sugared pork fat. Nowadays, filling with others ingredients such as yam paste, durian , salted egg yolk, winter melon, dried sausage, etc. have been added to suit all tastes. And durian and mung bean paste with one or two salted egg yolks filling are one of the most popular sold