01 - Bring a large pot of salted water to a boil. Cook elbow macaroni until al dente according to package instructions. Drain and rinse pasta under cold water to stop cooking.
02 - In a large mixing bowl, combine cooled macaroni, celery, red bell pepper, red onion, shredded carrots, and thawed peas.
03 - In a small bowl, whisk mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, and black pepper until fully blended.
04 - Pour dressing over macaroni and vegetables. Gently toss until all ingredients are evenly coated.
05 - If desired, fold in chopped parsley and hard-boiled eggs to the prepared salad.
06 - Cover the salad and refrigerate for at least 1 hour to allow flavors to meld.
07 - Stir salad gently just before serving. Taste and adjust seasoning if required.