Add the Maseca and salt to a mixing bowl and mix well.

Slowly add the warm water to the bowl and mix with your hand until you have a moist and soft dough.

Divide the dough into 6 even sized balls.

Cut through the sides of a ziploc bag making a flap. Then put one of the dough balls inside the bag.

Use a heavy pot to flatten the ball.

Put as much cheese that will fit on top of the flattened ball.

Fold the dough as if making an empanada. Use the plastic bag to help you do this.

Shape it back into a ball. Use the bag to help you do this. 

Put the flap back over the ball and flatten again. It shouldn't be thin like a tortilla. They should be thick.

Heat up a skillet over medium heat.

Coat the pot with enough oil to keep the pupusa from sticking.

Once the oil is hot add the pupusa and cook for 3-4 minutes. Then flip and cook for an additional 3-4 minutes or until the pupusa is nicely browned and cooked through.

Transfer the pupusa to a paper towel lined plate and repeat the above steps with the remaining five balls.

Add more oil as needed to keep the pupusas from sticking.