In a large bowl, combine the chopped zucchini, fresh sweet corn, diced bell pepper, finely chopped red onion, and cilantro. Gently mix until evenly distributed.

In a separate bowl, whisk together the sour cream, mayonnaise, olive oil, and lime juice until smooth. Add cumin, chili powder, salt, and pepper to taste.

Pour the creamy dressing over the veggie mixture and gently toss to combine.

Transfer the salad to a serving bowl and serve immediately for optimal freshness.