Heat olive oil over medium low heat. Cook and stir jalapeno pepper in hot oil until softened, about 5 minutes. Add onion; cook and stir until the onion is soft, about 2 minutes more. Add corn. Season mixture with salt and black pepper. Continue cooking and stirring until the corn is hot, about 5 minutes. Sprinkle cilantro over the mixture, stir, and simmer another 30 to 60 seconds.
