Begin by setting the Instant Pot to the sauté function. Add a splash of olive oil and sauté the diced onion and jalapeño until softened, about 3-4 minutes.
Stir in the minced garlic and cook for an additional minute until fragrant.
Add the chicken breasts to the pot, followed by the diced tomatoes (with their juice), black beans, corn, chicken broth, chili powder, cumin, salt, and pepper.
Close the Instant Pot lid securely and set the valve to seal. Select the Pressure Cook setting and cook on high pressure for 10 minutes.
Once the cooking time is completed, allow for a natural release for 10 minutes, then carefully switch the valve to vent for the remaining pressure to escape.
Remove the chicken breasts from the pot and shred them using two forks. Return the shredded chicken back to the soup.
Stir in the lime juice for brightness and additional seasoning if needed.
Serve the soup hot, topped with crushed tortilla chips, fresh cilantro, and slices of avocado.
Notes
Adjust the heat by adding or removing jalapeño seeds.