In a bowl, mix together the mayonnaise, sour cream, lime juice, lime zest, chili powder, smoked paprika, garlic powder, and salt until well combined. Set aside.
Place the cleaned corn directly on the grill grates, cooking for about 10-12 minutes, turning occasionally until the corn is tender and has grill marks.
Once the corn is cooked, remove it from the grill and immediately brush each ear generously with the chili-lime mixture.
If desired, sprinkle crumbled feta cheese over the coated corn for an added savory flavor.
Garnish with fresh cilantro before serving.
Notes
Optional to add crumbled feta cheese for extra flavor.