Cook butter and onion
Add flour, stir and cook. Remove from heat.
Stir in seasonings and sour cream.
Fold in beans.
Place in lightly greased 2L dish.
Cover with grated cheese and corn flake crumbs.
Sprinkle with dots of butter.
Bake for 30-45 minutes at 350 degrees.
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Source code is licensed under the GPLv2 and available at https://github.com/dgrant/django_recipes