Leave corn cobs whole or snap in half before cooking for more manageable eating.
Grill corn on the cob on a hot grill 8-10 minutes, turning often.
Corn should have char marks.
(It's more authentic to grill the corn, but you can steam it if you don't have access to a grill.)
While still hot, use a butter knife to spread mayonnaise thickly on corn.
Quickly roll in crumbled cotija cheese.
Sprinkle with chili powder and chopped cilantro.
Spritz with lime wedges.