01 - Bring a large pot of salted water to a boil. Add elbow macaroni and cook according to package instructions until al dente. Drain thoroughly and rinse under cold water to cool.
02 - In a large mixing bowl, combine cooled macaroni, chopped celery, red bell pepper, red onion, shredded carrots, and thawed peas.
03 - In a separate small bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, and black pepper until smooth and fully emulsified.
04 - Pour the prepared dressing over the pasta and vegetable mixture. Gently fold until every ingredient is evenly coated.
05 - If desired, gently fold in chopped fresh parsley and hard-boiled eggs for enhanced texture and flavor.
06 - Cover and refrigerate the salad for at least 1 hour to allow flavors to develop.
07 - Stir the salad gently before serving. Taste and adjust seasoning if necessary.