Heat a tablespoon of oil in a wok or skillet over medium high heat and place the peppers in the oil, stuffing side down. Cook until they are browned, about 2 minutes. Turn the peppers over to sear the bottoms for another 2 minutes, turning the heat down if they start to get too dark. If using the long hot green peppers or another variety of thin-fleshed pepper, simply transfer them to the serving plate.