Bring a large pot of salted water to a rolling boil. Add rotini pasta and cook according to package instructions until al dente, about 8-10 minutes. Drain and rinse under cold water.

In a large mixing bowl, combine the cooled pasta with corn, cherry tomatoes, and red onion. Toss gently to mix.

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

Pour the dressing over the pasta mixture and toss gently until well-coated.

Cover and refrigerate for at least 30 minutes before serving. Stir before serving.