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Using a knife or corn cutter, strip the corn off of the cobs.
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Heat the vegetable oil in a nonstick skillet or cast iron skillet.
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Add the corn kernels and salt and toss.
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Allow to cook without stirring for 2-3 minutes, until charred on the side touching the pan.
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Repeat, tossing the corn and allowing to cook without stirring for 2-3 minutes on each side-until charred on each additional side.
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Place corn in a large bowl.
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Add mayonnaise, Cotija cheese, scallions, cilantro, jalapeño, garlic, lime juice, and chili powder and combine.
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Serve hot or cold.