In a small bowl, add about 1 cup of beans and mash with a fork. It helps to thicken the chili.
To 6 or 8 quart Instant Pot, add ingredients in the following order: garlic, onion, corn, whole and mashed beans, chicken breasts, green chiles, cumin, oregano, chili powder, cayenne pepper, salt, pepper and 1 cup broth. Do not stir.
Close the lid, set pressure vent to Sealing and Pressure Cook on High or Manual for 20 minutes.
Release pressure using Quick Release method by turning pressure valve to Venting position immediately after cooking.
Open the lid, remove chicken and shred with 2 forks or meat claws.
Return chicken to the Instant Pot along with lime juice, cilantro and yogurt. Stir immediately, so yogurt doesn't curdle.
Serve warm with your favorite toppings like tortilla chips, cheese, more cilantro and lime.