Natillas is a traditional dessert made by boiling a combination of milk, egg yolks, sugar, flour, salt, and vanilla. Although the vanilla-flavored variety is the most popular one, natillas can also be flavored with chocolate or turrón.
The dessert is often sprinkled with cinnamon on top before serving in order to improve its flavors even further. It is believed that natillas was invented by nuns who used to prepare it in convents across Europe.