Preheat the grill to medium-high heat. Grill the corn for about 10 minutes, turning occasionally until charred. Remove from grill and let cool.

In a large mixing bowl, combine the grilled corn kernels, cherry tomatoes, cucumber, red onion, and cilantro.

In a separate bowl, whisk together the mayonnaise, lime juice, chili powder, garlic powder, salt, and black pepper until smooth.

Pour the dressing over the salad mixture and toss until evenly coated. Top with crumbled feta cheese and lime zest before serving.