Select the Saute function on the Instant Pot and add one tablespoon of olive oil.
Sauté the onion and garlic for 4 minutes until the onion is translucent.
Add the chicken breasts, white beans, green chilies, chicken broth, cumin, chili powder, oregano, salt, and pepper to the pot.
Secure the lid and set the steam release valve to the Sealing position.
Select Pressure Cook on High for 15 minutes.
Once the cooking cycle is complete, allow the pressure to release naturally for 10 minutes, then manually release any remaining pressure.
Remove the chicken breasts from the pot and shred them using two forks.
Return the shredded chicken to the pot and stir in the frozen corn.
Allow the residual heat to warm the corn for 2 minutes before serving.
Garnish with fresh cilantro.