1. Preheat oven to 400 degrees F. Brush corn lightly with butter and sprinkle with salt and pepper. Roast 20-25 minutes. Alternately you can grill or boil it.
2. Working with one ear of corn at time brush with mayonnaise, sprinkle with cheese, cilantro and chile powder, pressing it onto the corn to help it stick. Sprinkle with salt and pepper. Serve with lime wedges.