Boil the pasta according to the package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
In a small bowl, whisk together mayonnaise, sour cream, lemon juice, garlic powder, salt, and black pepper. Mix well until smooth.
In a large mixing bowl, combine the cooked pasta, shredded chicken, corn, cherry tomatoes, red onion, and cheese. Pour the dressing over the salad and toss until everything is well coated.
Cover and refrigerate for at least 30 minutes to allow the flavors to meld together. This enhances the taste and makes the salad even more delicious.