Slow Cooker Buffalo Chicken Cheese Soup

Name: Slow Cooker Buffalo Chicken Cheese Soup
Ingredients: 1 tablespoon butter; 1/2 large onion, peeled and chopped; 2 garlic cloves, minced; 3 large carrots, sliced; 3 celery stalks, sliced; 1 pound boneless skinless chicken breast; 1/4 cup Frank's Red Hot cayenne sauce; 1/4 cup good blue cheese dressing (could also use low-cal dressing); 4 cups chicken stock; 1/2 cup crispy tortilla chip strips; 1/4 cup crumbled blue cheese; 1/4 cup chopped green onions