1Preheat a grill or grill pan over medium-high heat.
Grill the corn until charred on all sides, about 10 minutes. Let it cool slightly.
Cut the kernels off the cob and place them in a large bowl.
In a small bowl, mix together the mayonnaise, sour cream, lime juice, and chili powder.
Pour the dressing over the corn and toss to combine.
Add the crumbled cotija cheese and chopped cilantro to the corn mixture and stir gently.
Season with salt to taste.
Serve immediately or refrigerate for later.