Begin by chopping the bell peppers, onion, and garlic. Place the chicken breasts into the slow cooker, then add the chopped peppers, onion, and garlic on top.
Pour in the diced tomatoes and chicken broth, ensuring all ingredients are submerged. Sprinkle in the cumin, chili powder, and garlic powder for a warm, smoky spice base.
Cover the slow cooker and cook on low for 6 to 8 hours, until the chicken is tender and shreds easily when tested with a fork.
Once cooked, open the lid and shred the chicken directly in the slow cooker using two forks. Mix gently to distribute the shredded meat throughout the broth.
Add the black beans and corn (if using), then cover and cook on low for another 30 minutes to meld all flavors together.
Taste the soup and adjust seasoning if needed—add salt, pepper, or more chili powder for extra spice. Keep the lid on to keep flavors concentrated.
To serve, ladle the hot soup into bowls, then top with crushed tortilla chips, fresh cilantro, a squeeze of lime, and shredded cheese if desired.
Spoon the soup into bowls, garnish with your favorite toppings, and enjoy this cozy, flavorful meal that’s perfect for busy nights.