Rub ears of corn with cold butter (easier to coat the raw ears of corn evenly)
Grill corn for 15 to 20 minutes, until tender, turning a couple of times to char evenly.
Meanwhile, in a small bowl whisk chili powder into mayonnaise and set aside.
Transfer corn to a serving platter and slather each cob evenly with chili mayonnaise. Sprinkle cotija, cilantro, and smoked paprika over cobs. Serve with lime wedges.
Video
Notes
Use parmesan cheese, queso fresco, or feta if you can't find cotija cheese at your local grocery store.
If you'd rather skip the mayonnaise, use Mexican crema or sour cream instead.