Nothing warms you up quite like this chicken tortilla soup. What's in chicken tortilla soup? Nope—rotisserie chicken also works, and will cut down on the amount of time the soup needs to cook in the slow cooker. It sounds like something fancy a restaurant would do, but it's actually SO easy: Simply cut corn tortillas into small strips and cook them in about a tablespoon of olive oil until crispy. We like to load it up with avocado, tortilla croutons, and sour cream, but really any of your favorite nacho fixings work.