Preheat your grill to medium-high heat.
Husk the corn and remove any silk.
Grill the corn for about 10-15 minutes, turning occasionally until charred.
In a bowl, mix mayonnaise, sour cream, lime juice, garlic powder, and a pinch of salt.
Once the corn is grilled, remove it from the heat.
Brush the creamy mixture generously over each ear of corn.
Sprinkle crumbled cotija cheese on top of the creamy corn.
Dust with chili powder and additional garlic powder if desired.
Garnish with fresh cilantro.
Serve immediately with lime wedges.