Place the chicken breasts, carrots, onions, garlic, cilantro, jalapeno, bay leaf, Old El Paso Enchilada Sauce, and chicken broth in a large slow cooker. Season with 1/2 teaspoon salt and 1/4 teaspoon black pepper. Cover and turn the slow cooker on medium to low. Slow cook for 8-10 hours.
When ready to eat, remove the chicken breasts and shred with two forks. Place the chicken back into the soup. Then crumble 8 Old El Paso Tostada Shells into the soup and stir.
To serve: Ladle the hot soup into bowls and garnish with more crumbled tostada shells, a sprinkle of cheese, sliced avocado, and diced fresh tomato.
This slow cooker recipe is made to simmer all day while you are at work. You can turn your slow cooker on high and cook it within 3-4 hours, but you will need to saute your onions first, because they won't soften in the slow cooker in that time.