01 - Boil pasta according to package directions until al dente. Drain thoroughly and rinse under cold running water to stop cooking and cool completely.
02 - Combine halved cherry tomatoes, diced red bell pepper, sliced red onion, diced cucumber, and chopped celery in a large mixing bowl.
03 - Whisk together mayonnaise, sour cream, ketchup, pickle juice (or vinegar), Dijon mustard, smoked paprika, garlic powder, salt, and pepper until smooth and uniformly pink.
04 - Add cooled pasta to the vegetable mixture. Pour dressing over pasta and toss gently until all ingredients are evenly coated.
05 - Fold in chopped parsley and shredded cheddar cheese if using. Mix carefully to avoid crushing pasta.
06 - Refrigerate for at least 1 hour to allow flavors to meld. Serve cold, garnished with additional parsley if desired.