Add the chicken breast to the instant pot, followed by chicken broth, beans, chili powder, cumin, onion powder, garlic powder, salt, white pepper, green chiles, green chile salsa, and frozen corn.
Close the lid and set the pressure valve to the sealing position. Select Manual/Pressure Cook and set it for 10 minutes.
After cooking, let the pressure release naturally for 10 minutes followed by a quick release. Open the lid after the pin drops.
While the Instant Pot is naturally releasing. Make your white sauce.
In a small saucepan melt butter over medium-high heat. Once completely melted whisk in flour and continually stir until mixture is bubbly and cook for 2-3 minutes. Slowly whisk in the milk and chicken base.
Allow the sauce to simmer for 4-5 minutes while constantly whisking. Cook until sauce is slightly thickened. Season with salt and pepper to taste.
Once done, naturally release for 10 minutes. Then quick release until there is no steam left. Remove the chicken and shred.
Place chicken back in the Instant Pot, pour in the white sauce and sour cream and stir to combine. Season with more salt and pepper if desired.
Ladle the soup into bowls and garnish with your favorite toppings.