You can use many ingredients for the filling, as well as countless combinations Queso fresco, Cheese, Mozzarella, Gouda cheese, shredded beef, ham, chorizo, pork cracklings, etc.
Preparation
In a blender or a food processor mix the corn, egg, milk, corn meal, melted butter, sugar and salt, until you get a thick and chunky dough, this should not be too thick.
Heat a griddle or nonstick skillet on the stove over medium heat, smear a little oil on a paper towel and grease the griddle lightly for each pancake, then pour a ladle of the corn mix on the griddle about ½ cup of the mixture, spreading it with a spoon or spatula to form a circle. When the bubbles formed on the entire surface and it seems to be dry and get golden edges, flip it with a spatula to cook the other side, about 1-2 minute on each side. Remove it from the griddle or skillet and reserve, keeping them warm.