Chile rellenos stuff roasted poblano peppers with melted cheese, batter-dipped and fried to golden perfection. This protein-rich, vegetarian-friendly Mexican-American classic is a family favorite full of smoky, cheesy flavor.
Roast the poblano peppers over an open flame or under a broiler, turning until the skin is charred and blistered all over, about 8–10 minutes.
Transfer the roasted peppers to a bowl, cover with plastic wrap, and let them steam for 10 minutes to loosen the skins. Carefully peel off the skins without tearing the peppers.
Slit each pepper lengthwise and gently remove seeds and membranes, taking care not to rip the sides.
Cut Monterey Jack cheese into sticks and stuff each pepper fully. Lightly season the cheese filling with a pinch of black pepper.
Separate the eggs; beat the egg whites with a pinch of salt until stiff peaks form, then gently fold in the yolks to make a fluffy batter.
Dredge the stuffed peppers lightly in flour, ensuring complete coverage for batter adherence.
Heat 1.5 cups vegetable oil in a deep skillet to 350°F (medium-high heat) for frying control.
Dip each floured pepper into the egg batter, letting excess drip off, then gently lay into the hot oil.
Fry in batches, turning once, until golden brown and crisp on all sides, about 2–3 minutes per side. Do not overcrowd the pan.
Remove fried chile rellenos and drain on paper towels. Let cool 2–3 minutes, then serve immediately for optimum texture.