Saute onion in olive oil
over meduim heat in heavy stock pot for about 5 minutes,
add garlic and stir in. Cook about one minute more. Stir
in the tomatoes and other seasonings and cook another
minute or so. Stir in chicken broth and peppers. Bring
to boiling; cover and simmer for 30 minutes or more. Run
through a blender or use a 'motor boat' stick to
combine.
Put crunched tortilla chips
in a bowl with cheese, avocados, and sour cream (omit if
desired) . Ladle soup over; squeeze a bit of lime juice
into each bowl and top with small handful of cilantro
and/or green onion. Serve immediately. .