Open and drain the white beans.
Chop the onion, green bell peppers, and celery.
Slice the andouille sausage.
To a Dutch oven or large saucepan, add the white beans, diced tomatoes, onion, bell peppers, celery, sliced sausage, minced garlic, Cajun seasoning and 2 cups chicken stock.
Bring to bubbling and simmer for 15 minutes. Season with salt and pepper.
Warm the French bread.
Serve Andouille Cajun Soup with French bread slices.