Turn your oven’s broiler up to high. Peel off the outer layers of the corn and clean off all the corn silk. Leave the green ends attached for a convenient handhold. Place the cobs on a baking pan under the broiler for 2 to 3 minutes, then rotate them and repeat until they’re brown and toasty all the way around. The broiling shouldn’t take more than 10 minutes total. Working quickly, spread a tablespoon of mayonnaise over each cob, lightly coating every kernel. Next, sprinkle the cheese all over the corn. It should stick fairly easily to the mayonnaise, but you’ll probably get a little messy coating them thoroughly. Sprinkle chili powder over the corn, but not too heavy or it’ll be gritty. Use any chili powder you like; ancho or cayenne are great. Lastly, squeeze lime juice all over and serve hot!