01 - Bring a large pot of salted water to a boil. Add elbow macaroni and cook until al dente according to package directions. Drain and rinse under cold water to cool completely.
02 - In a large mixing bowl, place the cooled macaroni, celery, red bell pepper, red onion, shredded carrots, and thawed peas.
03 - In a small bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, and black pepper until smooth and fully blended.
04 - Pour the dressing over the macaroni and vegetable mixture. Stir gently until all ingredients are evenly coated.
05 - If desired, fold in the chopped fresh parsley and hard-boiled eggs. Mix gently to distribute evenly.
06 - Cover the salad and refrigerate for at least 1 hour to allow flavors to develop fully.
07 - Before serving, stir the salad gently and adjust seasoning as needed.