In a large mixing bowl, combine the diced cucumber, shredded carrots, chopped celery, diced red bell pepper, finely chopped red onion, and chopped parsley.
In a separate small bowl, whisk together the olive oil, apple cider vinegar, honey, garlic powder, salt, and pepper until well combined.
Pour the dressing over the vegetable mixture and toss gently to coat all the ingredients evenly.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve chilled as a refreshing side dish.