Roast the peppers over medium heat, turning them occasionally until the skins blacken and crack.
Transfer the peppers to a plastic bag, seal it, and set aside for about 15 minutes. Preheat the oven to 180ºC. Remove the peppers from the bag.
Peel them one by one, carefully, under a stream of cold water. Cut them open lengthwise and remove the seeds and ribs, taking care to keep them intact. Fill them with refried beans.
Whip the egg whites until stiff peaks form in a large bowl. In another bowl, lightly beat the yolks with the salt. Gently pour the yolks into the bowl of egg whites and mix.
Coat the chiles. Arrange them in a baking dish. Sprinkle the grated cheese on top and place them in the oven until the cheese melts.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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