Preheat your grill to high heat.
Shuck and clean the corn.
Combine the mayo, sour cream, jalapeno, chili powder and lime. Stir to combine and chill until ready to use.
Grill the corn until charred to your liking. Remove from grill and cut each ear in half.
Slather the mayo on each ear. Sprinkle with cilantro. Roll in cheese. Serve immediately.