Preheat your grill to 400°F (200°C).
Place the corn directly on the grill grates. Cook for about 10–12 minutes, turning every few minutes to ensure even charring on all sides. The corn should be tender with light grill marks.
While the corn is grilling, prepare the sauce. In a small mixing bowl, combine the sour cream, mayonnaise, cotija cheese, crushed garlic, lime zest, lime juice, salt, and chopped cilantro.
Stir the mixture until smooth and well combined. Taste and adjust seasoning if needed.
Once the corn is fully grilled, remove it from the heat and let it cool slightly for easier handling.
Using a spoon or brush, spread the creamy mixture evenly over each ear of corn, coating it generously.
Sprinkle chipotle chili powder evenly over the coated corn for a smoky, slightly spicy finish.
Top with extra crumbled cotija cheese and a little more chopped cilantro for garnish.
Serve immediately while warm.
Enjoy!