Step 1: Cook the Pasta. Bring a large pot of salted water to a boil. Add rotini pasta and cook for 8-10 minutes. Drain and rinse under cold water.

Step 2: Prepare the Vegetables. Chop cherry tomatoes in half, finely dice red onion, and cut corn kernels off the cob if using fresh corn.

Step 3: Mix the Salad Ingredients. In a mixing bowl, combine cooled pasta, corn, cherry tomatoes, and red onion. Add feta cheese and cilantro.

Step 4: Whisk the Dressing. In a separate bowl, whisk mayonnaise, sour cream, lime juice, chili powder, garlic powder, salt, and pepper until smooth.

Step 5: Combine and Toss. Pour the dressing over the pasta mixture and toss until evenly coated.

Step 6: Chill Before Serving. Cover and refrigerate for at least 30 minutes before serving.

Step 7: Serve and Enjoy. Give the salad a stir, adjust seasonings if needed, and serve chilled.