In a large pot, heat 1 tablespoon of olive oil over medium heat.
Add the diced onions and bell peppers, sautéing for about 5 minutes or until softened.
Stir in the minced garlic and cook for another minute until fragrant.
Add the chicken breasts to the pot, followed by the taco seasoning, chicken broth, black beans, corn, diced tomatoes, and tomato paste. Stir to combine.
Bring the mixture to a gentle boil, then reduce the heat to low. Cover the pot and simmer for about 20-25 minutes, until the chicken is cooked through.
Remove the chicken breasts from the pot and shred them using two forks. Return the shredded chicken to the soup and mix well.
Season with salt and pepper to taste, adjusting as needed.
To serve, ladle the soup into bowls and top with shredded cheddar cheese, a dollop of sour cream, and a sprinkle of fresh cilantro.
Notes
Serve with tortilla chips on the side and garnish with extra cilantro and a lime wedge for a fresh touch.