In a bowl, whisk together the mayonnaise, lime juice, and chili powder. Set aside.
Heat a large cast-iron skillet over medium-high heat. Add the corn; cook for 5 minutes without stirring. Toss with a spatula, then continue cooking until slightly browned (about 3 minutes more). Remove from heat.
Stir in the mayonnaise mixture and cilantro. Top servings with cotija cheese.
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