In a small bowl, make the sauce by whisking together the mayonnaise, crema (or sour cream), chopped cilantro, and lime juice.
In a smaller bowl, mix together the cayenne pepper and chili powder
Grill the corn directly on the grates without moving, until kernels start to turn brown and charred (about 2-3 mins) – repeat this process until all sides are grilled (about 10 mins).
Once grilled, using a pastry brush, brush the sauce onto each husk. Sprinkle on the cayenne and chili mix and top with the crumbled cheese.
You can serve these husks whole, or you can cut the kernels off the cob, mix together with some of the sauce and serve as aside dish or salad.