By eHow Food & Drink Editor
Using a medium-sized sauté pan, cook the onions and peppers in the oil on medium-high heat until they are soft and slightly browned.
Fold the tortilla so the bean, cheese and vegetable mixture is completely covered. If using cast-iron, place the filled tortilla on the griddle and press lightly to ensure the tortilla has good contact with the pan. If using a skillet, melt two teaspoons of butter in it, and then place the folded tortilla in the skillet and press down evenly.
eHow Food & Drink Editor