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Ingredients
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Poblano Peppers
Filling
Batter & Coating
Optional Sauce / Garnish
Method
Prepare and Roast Peppers
Roast and peel
Preheat a gas burner to medium-high or heat a heavy skillet/grill pan over high heat. Lightly brush the poblano peppers with 1 tbs vegetable oil and sprinkle a little kosher salt. Place peppers directly over the flame or on the hot pan and roast, turning frequently, until the skin is evenly blackened and blistered on all sides, about 8–12 minutes.
Transfer the blistered peppers to a bowl and cover tightly with plastic wrap or place in a sealable plastic bag for 10–15 minutes to steam. This loosens the skins for easy peeling.
After steaming, peel off the charred skin with your fingers or a small knife, being careful not to tear the pepper flesh. Rinse briefly only if needed to remove stubborn bits, then pat dry.
Make a lengthwise slit along one side of each poblano and carefully remove the seeds and membranes with a small spoon, leaving the pepper intact so it can be stuffed. Set peppers aside on a tray.
Make the Filling
In a medium bowl, combine 1 cup cooked shredded chicken or 1 cup crumbled cheese (if making vegetarian), 1/4 cup finely chopped onion, 1 clove minced garlic, 1/4 cup diced tomato, 1 tbs chopped cilantro, 1/4 tsp ground cumin, 1/2 tsp salt, 1/4 tsp black pepper and 1 tsp lime juice. Mix until evenly combined.
Taste and adjust seasoning. The filling should be flavorful but not overly wet — if too moist, squeeze out a little excess liquid from tomatoes or use a bit more shredded cheese to bind.
Gently stuff each prepared poblano pepper with half of the filling, pressing lightly so the pepper holds its shape but is not overfilled (about 1/2 cup filling per pepper). Set stuffed peppers on a plate seam-side down.
Batter, Dredge and Fry
Set up a dredging station: shallow bowl with 1/2 cup all-purpose flour (seasoned with a pinch of salt), a small bowl for egg yolks, and a mixing bowl for whipped egg whites.
Separate the 2 eggs. In the small bowl whisk the 2 egg yolks with 2 tbsp cold milk until combined; add 1/8 tsp baking powder and 1/8 tsp salt and 1 tsp cornstarch, whisking until smooth.
In the mixing bowl, using a hand mixer or whisk, beat the 2 egg whites until they form stiff glossy peaks (soft peaks first, then continue to stiff). This will create a light, airy batter when combined with the yolk mixture during assembly (traditional chiles rellenos often use only whipped whites for an airy coating).
Heat 1 cup oil in a heavy skillet over medium heat to 350°F (175°C). If you don't have a thermometer, test by dropping a little batter — it should sizzle and rise slowly without burning.
Working with one pepper at a time: gently dredge the stuffed pepper in the seasoned flour, shaking off excess. Then dip briefly into the egg yolk mixture so it lightly coats, then immediately transfer to the whipped egg whites and spoon or roll whites onto the pepper to coat completely with an even, airy layer. Alternatively, you may fully coat by dipping into yolks then spooning beaten whites over it so pepper is covered in a thick meringue-like coat.
Carefully place the coated pepper into the hot oil seam-side up. Fry until the batter is golden brown and crisp on the first side, about 3–4 minutes. Gently turn (use tongs) and fry the other side another 2–3 minutes until evenly golden and the pepper is heated through. Fry the second pepper the same way. Avoid overcrowding the pan; maintain oil temperature between batches.
Transfer fried chiles rellenos to a paper-towel-lined plate to drain briefly.
Finish and Serve
If using sauce: warm 1/2 cup tomato-based salsa or ranchera sauce in a small saucepan over medium heat. Spoon a few tablespoons onto each serving plate and place one chile relleno on top. Alternatively, pour warm sauce over the peppers after plating.
Sprinkle each pepper with about 2 tbsp (combined) of crumbled queso fresco or grated Oaxaca/monterey jack, garnish with fresh cilantro leaves and serve with lime wedges on the side.
Serve immediately while hot and crisp. Chiles rellenos are best eaten the same day; if making ahead, reheat briefly in a 375°F (190°C) oven for 8–10 minutes to crisp before serving.