While the pasta is cooling, in a small bowl mix together the dressing ingredients and set aside for the flavors to start combining.
1 medium Red bell pepper, diced, 1/2 cup Red onion, diced, 3 medium Celery ribs, diced, 1/3 cup Fresh parsley, minced, 1 cup Mayonnaise, 1/2 cup Sour cream, 1 tbsp Dijon mustard, 2 tbsp Apple cider vinegar, 1 tsp Garlic powder, 2 tsp Granulated sugar, 1 tsp Fresh ground black pepper, 1 tsp Kosher salt