- If you are using canned beans, skip this step.  Add beans to IP.  Cover with 6 cups water.  Lock lid.  Set valve to sealing.  Cook on manual-high 37 minutes.  NPR completely. 
- Drain beans.  Remove beans from IP and set aside.  Clean or rinse insert.  Take half the beans, 1 can tomatoes, and 1 can green chiles and place in a blender or food processor.  Process until smooth.  Set aside. 
- Add oil to IP.  Using sauté function, cook onions 3 minutes. Add garlic and cumin and cook 1 more minute. Add broth; bring to a simmer.  Let simmer 1 minute.  Hit cancel. 
- Add bean mixture from blender to IP, along with remaining whole beans. Add remaining tomatoes and green chiles.  Add worcestershire and red pepper flakes. Stir well.  Keep on sauté 5 minutes, stirring frequently, until heated through.  Garnish with cheddar and avocado, if desired. 
- To freeze, make soup as directed above, then spoon into freezer-safe containers.  Reheat in microwave.