Char bell peppers in frying pan or in broiler; place in bag and let stand for 10 minutes.
Peel, seed and chop the peppers into small pieces.
Heat oil in heavy saucepan or pot over medium heat.
Add onion and saute till tender, about 5 minutes.
Add bell peppers and crushed red pepper and saute for a minute.
Add broth and beans. Bring to boil.
Reduce heat, cover, and simmer for 15 minutes.
Strain vegetables, reserving broth. Transfer vegetables to blender and puree.
Gradually add in 2 cups broth.
Transfer puree to bowl and stir in remaining broth.
Season with salt and pepper; top with chives.
Can serve hot or cold.