In a frying pan, on medium-high heat, sauté the onion, jalapeño and garlic in the olive oil until softened. Add to the slow cooker.
Add the enchilada sauce, Rotel, crushed tomatoes, black beans, corn, chicken broth, cumin, chili powder, onion powder, oregano, salt, and pepper. Stir well.
Place the chicken breasts into the soup mixture and nestle them down in so they are covered.
Cook on Low for 6-8 hours, or High 3-4 hours, or until the meat is done and is 165°F internal temperature.
Remove the chicken to a plate and use two forks to shred the meat. Then return the meat to the soup, along with the cilantro, and stir well.
Serve in bowls, over rice if using. Garnish with crushed tortilla chips and then any of the following: green onion, sour cream, avocado, or cheese on top.