– 16 ounce box Rotini pasta, cooked – 13 slices bacon – 1/2 large red onion, finely diced – 1 1/2 cups cheddar cheese – 2 cups romaine lettuce – 1 avocado, cut into small pieces – 1 1/2 cups cherry tomatoes – 1/4 cup parsley, chopped – 1 ounce packed Hidden Valley Dressing Mix dry – 1 1/2 cups mayonnaise – 1/2 cup sour cream