Place chicken breasts in the bottom of the crockpot.
Add black beans, corn, and diced tomatoes on top of the chicken.
Sprinkle the diced green bell pepper and chopped onion over the mixture.
Add minced garlic and taco seasoning for flavor.
Pour the chicken broth over all ingredients.
Season with salt and pepper to taste.
Cover and cook on low for 6-8 hours or on high for 3-4 hours.
Once cooked, shred the chicken directly in the pot using two forks.
Stir the soup well to combine all ingredients.
Serve hot, garnished with tortilla strips and optional toppings.