Prepare the sweet corn by thawing frozen corn or cooking fresh corn in boiling water for 2-3 minutes. Drain and cool.

In a large bowl, toss together the corn, cherry tomatoes, cucumbers, and red onion. Add crumbled feta.

In a separate bowl, whisk mayonnaise, sour cream, lime juice, garlic powder, chili powder, salt, and pepper until smooth.

Pour the dressing over the salad and gently toss to combine without over-mixing.

Cover and refrigerate for at least 30 minutes to meld the flavors. Longer chilling is better.

Before serving, taste and adjust seasoning. Serve chilled, optionally garnished with extra feta.