1. Place the peppers on a hot grill or other open flame and blacken evenly on all sides. Place the blackened peppers in a paper bag and close the bag so the peppers steam and the burnt skin is loosened, about 20 minutes.
2. Place the peppers on a work surface and carefully scrape the burnt skin away with the back side of a knife or with paper towels. Don't worry about leaving a few bits of skin stuck to the peppers. It'll just add flavor.
3. Cut a slit from the tem end of each pepper about half way to the tip. Carefully remove the seeds. Leaving a few seeds inside isn't a big deal. Tearing the flesh while trying to remove all of the seeds is worse.
4. Carefully place a layer of fish inside the pepper from tip to stem. Do not overstuff!
5. Carefully lay a strip of each cheese on the fish. If the peppers split during the stuffing part, just secure the opening with 2 or 3 toothpicks, which can be removed after frying.
6. Mound the masa flour on a large plate and season with Hi Mountain Gourmet Fish Seasoning or salt and pepper. Gently coat the peppers with the seasoned flour.
7. Separate the eggs with the yolks in one bowl and the whites in another. Beat the yolks with a whisk or fork for a minute or two and then whisk the beaten yolks into the whites. Whisk for a minute more. Season the egg mixture with Hi Mountain Gourmet Fish Seasoning or salt and pepper. Dip the dusted peppers into the egg mixture.
8. Place the battered peppers, 1 or 2 at a time, into 350-degree oil and fry until golden brown. Drain on paper towels.
9. Arrange the peppers on plates and serve with salsa, spicy vinaigrette, chipotle mayonnaise, or your own favorite sauce.