Place the boneless skinless chicken breasts into the base of your 5-quart slow cooker.
Season the chicken lightly with salt and pepper as you prefer.
Add the diced onion and minced garlic on top of the chicken.
Pour in the chicken broth, then add the water, corn with its juice, diced tomatoes with green chiles including the juice, and enchilada sauce.
Sprinkle the taco seasoning packet and chili powder evenly over the contents, then stir everything together gently.
Cover the slow cooker and let it cook on low for approximately 8 to 10 hours.
About fifteen minutes before you're ready to eat, remove the chicken breasts and shred them finely using two forks.
Return the shredded chicken into the crock pot and mix it thoroughly into the soup.
Let the soup continue cooking uncovered for another 15 minutes to blend the flavors.
Serve the soup hot, garnished with shredded cheese and topped with crunchy tortilla strips.