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Remove the seeds
Insert a sharp knife into the top of the chile, just under the stem and slice downward about halfway down the chile. Using a spoon or a knife, scrape the seeds and the white membrane out, without tearing the flesh of the chile. If the chile is extremely soft, you may not even need a knife. You may be able to just use your fingers to pull it apart a bit so you can get inside.Continue to 3 of 7 below.
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Stuff the chiles
Place a slice of cheese into the chile, but don't force it. If the cheese is too large, trim it down until it fits inside. Make sure the open edges of the chile still come together. You can also use a filling to stuff the chiles with such as this chicken and cheese fillingContinue to 4 of 7 below.
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Prepare the chiles
This step is optional Place half of the flour on the bottom of a plate. Place the chiles on the flour and sprinkle the rest of the flour on top. Use your finger to make sure the entire chile is coated. Dust off remaining flour and set chiles aside. If you rinsed your chiles in water, this step is important for the batter to stick.
Chiles naturally have oils in them, so if the oils were rinsed away or removed during the steaming process, you may need to do this to get the batter to stick. Also, if the chile is very "wet" the batter will slide off. So you can also try dabbing the moist chiles with a clean towel to dry them a bit.Continue to 5 of 7 below.
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For a simple batter, whip 5 to 7 egg whites until stiff peaks form. Beat the eggs in a separate bowl with a pinch or two of salt. Slowly fold the yolks into the batter without breaking down the whites. It's okay if the yolks look kind of streaked through the batter. Do not stir them in, or the whites will break down and the batter will become soupy.Continue to 6 of 7 below.
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Dip and Cook chiles
One at a time, dip the stuffed chiles into the batter and then carefully place them into the hot oil. Cook until batter is a crisp golden brown.Continue to 7 of 7 below.
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Drain excess oil and serve
Remove chiles from the oil and drain on paper towels. Serve immediately as they will become soggy as they cool. Chiles Rellenos really need to be eaten immediately. They do not re-heat well because they will be soggy.