Cook the Pasta: Bring a large pot of salted water to a boil. Add the rotini pasta and cook for about 8–10 minutes, or until al dente. Drain and rinse under cold water.

Mix Ingredients: In a mixing bowl, combine cooled rotini pasta, fresh corn, halved cherry tomatoes, and red onion. Add feta cheese and cilantro, then gently toss.

Prepare Dressing: Whisk together mayonnaise and sour cream until smooth. Stir in lime juice, chili powder, garlic powder, salt, and pepper.

Combine: Pour dressing over pasta mixture, gently toss together. Adjust seasonings if necessary.

Chill: Cover and refrigerate for at least 30 minutes to meld flavors before serving.