Combine the chicken breasts, broth, onion, garlic, diced tomatoes, cumin, and chili powder in a large pot. Bring the mixture to a boil over medium-high heat, then reduce to a simmer and cook for 20 minutes until the chicken is cooked through.
Remove the chicken from the pot, shred it with two forks, and return the shredded meat to the soup.
Stir in the corn and let it heat through for 5 minutes.
While the soup simmers, spread the tortilla strips in a single layer on a baking sheet and bake at 375°F for 10 minutes until they turn crisp and lightly golden.
Ladle the soup into bowls and top each serving with baked tortilla strips, diced avocado, cilantro leaves, and a squeeze of lime.