Creating the perfect Creamy Pasta Salad is simple when you follow these steps:

1. Cook the Pasta: Bring a large pot of salted water to a boil. Add the rotini pasta and cook according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
2. Prepare the Vegetables: While the pasta is cooking, chop the cherry tomatoes, cucumber, bell pepper, and red onion. If using frozen corn, thaw it according to package directions.
3. Make the Dressing: In a large bowl, combine the mayonnaise, sour cream, Dijon mustard, apple cider vinegar, salt, and pepper. Whisk until smooth and well combined.
4. Combine Ingredients: Add the cooked pasta, cherry tomatoes, cucumber, bell pepper, sweet corn, and red onion to the dressing. Stir gently until everything is well coated.
5. Taste and Adjust: Sample the salad and adjust seasoning with more salt and pepper if needed.
6. Chill (Optional): For best results, cover the salad and refrigerate for at least 30 minutes before serving. This allows the flavors to meld beautifully.
7. Garnish: Just before serving, sprinkle fresh parsley or basil on top for an added touch of flavor and color.

These straightforward steps will guide you in creating a delicious Creamy Pasta Salad that is sure to impress.