King Cake is the traditional dessert served during Mardi Gras. It’s a type of sweet roll, shaped into a ring. Traditional King Cake is made with a rich brioche dough filled with a sweet cinnamon cream cheese filling and topped with a sweet glaze and colored sanding sugar. Brioche is an extra-rich yeasted dough, it has eggs and lots of butter to make the dough rich and moist.

Source: In Fine Taste