Preheat the oven to 400 degrees F. Place the potatoes on a baking sheet, toss with the olive oil, season with salt and pepper and roast until golden and tender, about 30 minutes. Meanwhile, place the chicken in a saucepan and cover with water; bring to a simmer over medium heat and poach until cooked through, 15 to 20 minutes. Remove and let cool for a bit, then cut the chicken into bite-size pieces. In a large bowl, toss the potatoes, chicken, bacon, celery, onion, garlic and parsley. Mix in the Hidden Valley® Original Ranch® Dressing and salt and pepper to taste. Serve the salad in lettuce cups and roll up to eat.