Garden Salad with Homestyle Ranch Dressing

iceberg & romaine lettuce mix (iceberg lettuce, romaine lettuce, ranch dressing (canola oil, low fat buttermilk [skim milk, whey, water, corn starch, tapioca starch, disodium phosphate, carrageenan gum, locust bean gum, culture, water, egg yolk, non fat sour cream [cultured skim milk, corn starch, tapioca starch, carrageenan gum, locust bean gum, distilled vinegar, salt, natural flavor, sugar, dried garlic, dried onion, spices, modified corn starch, dried green onion, lactic acid, xanthan gum, guar gum, water, citric acid, sodium benzoate, cheddar cheese (cultured pasteurized milk, salt, cheese color, multi-grain croutons (wheat flour, sunflower and/or safflower oil, cracked rye, cracked wheat, yeast, 2% or less of sea salt, sugar, wheat gluten, dehydrated roasted garlic, natural olive oil flavor