Take a corn and remove the husks, clean and keep aside.
In small mixing bowl add crema/sour cream, mayonnaise, ¼ cup chopped cilantro leaves, garlic, chili powder, lime juice and then mix it well and keep aside.
Grill the corn ear on stove top or on grille about 4-5 mins or till all corn kernels become dark golden brown or charred all side.
Remove the corn from grille onto the plate, brush the prepared cream mixture over it all side as per your taste.
Sprinkle crumbled cotija or parmesan over the all corn ears, sprinkle lightly some cayenne pepper and salt over it, garnish it with chopped cilantro leaves and serve with lime wedge immediately.