Remove husks and silk from corn.
Brush with oil and sprinkle salt and pepper on corn. Set aside.
Mix together seasonings in a bowl.
Chop cilantro and mince garlic and add to seasonings. Set aside.
Zest lime and squeeze lime juice. Cut leftover lime into wedges, if desired. Set aside.
Preheat grill to medium setting.
Turn about every 5 minutes or so … keep an eye so as not to burn it, but some corn kernels may darken. After all of the corn is cooked, remove from heat. Depending upon the heat of your grill, this could be 10 to 15 minutes.
Add crema, mayonnaise, lime zest, lime juice and cheese to seasoning mixture. Stir well.
Brush onto corn cobs. Sprinkle chili powder on cobs.