This might be one of my Favorite breads, It is called "Conchas" and you can find them in a couple of different flavours, but my favorite is the "withe" one. I dont really know how is it made or what is the official name of its flavour but it is with this white cover.
Ir any of you havent tasted it before and you find one like this while travelin in Mexico, I will strongly recomend to try one.