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Heat grill.
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Pull husks of corn back and wrap husks with aluminum foil, leaving corn exposed.
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Remove all cornsilk from exposed corncobs.
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Place corn on grill, over low heat, rotating every few minutes, until tender and slightly charred, approximately 8-10 minutes.
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Place corn on a large platter.
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Unwrap husks and discard foil.
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Combine mayonnaise, sour cream, cotija cheese, chile powder, garlic and cilantro in a medium sized bowl. Stir until well-mixed.
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Using a large spoon or knife, spread the corn with the mayonnaise mixture, coating all sides of the corn.
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Squeeze lime over corn.
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Sprinkle with additional ancho chile powder.
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Serve while warm.