In a large pot, heat a drizzle of olive oil over medium heat.
Add chopped onions and bell peppers; sauté until softened.
Stir in minced garlic and cook for an additional minute.
Add the chicken breasts to the pot, followed by the taco seasoning.
Pour in the chicken broth, ensuring the chicken is submerged.
Bring the mixture to a boil, then reduce heat to simmer.
Cover and let it cook for about 20 minutes, or until chicken is cooked through.
Remove the chicken and shred it using two forks.
Return the shredded chicken to the pot along with black beans and corn.
Simmer for an additional 5 minutes, then season with salt and pepper to taste.