Place chicken breasts in the slow cooker. Pour in chicken broth, diced tomatoes, black beans, corn, and salsa.
Sprinkle chili powder, cumin, garlic powder, onion powder, salt, and pepper over the ingredients.
Cover and cook on low for 4-6 hours or on high for 2-3 hours, until chicken is cooked through and tender.
Remove chicken from the slow cooker and shred it with two forks. Return the shredded chicken to the pot.
Stir everything together. Taste and adjust seasonings if needed.
Serve hot, garnished with your favorite toppings such as shredded cheese, sour cream, cilantro, tortilla chips, or avocado.
Notes
This soup is incredibly versatile. Feel free to add other vegetables like diced bell peppers or onions. For a spicier soup, add a pinch of cayenne pepper.