Drain the tuna and break it into small pieces using a fork. Drain the pineapple and chop it finely. Grate or finely chop the cheese. Drain the corn.

Heat a dry skillet over low heat. Place the tortilla on the skillet and warm it for about 2 minutes. Flip the tortilla to the other side.

Immediately and evenly spread the tuna, pineapple, corn, and cheese over the tortilla. Cover the skillet and cook on very low heat until the cheese melts, about 5 minutes. Be careful not to burn the tortilla.

Transfer to a plate and enjoy!