Green Bean Casserole

This is really good if you like green beans

1 medium onion
1 cube of butter
3 tablespoons of flour
1 cup of sour cream
salt and pepper (to taste)
2 cans of green beans
shredded cheddar cheese

Saute' onions and butter until onions are white. add flour and salt and pepper. mix green beans in and sour cream, pour into casserole dish and smoother with shredded cheddar cheese. cover with foil and cook in oven at 350* for 30-45 minutes or until cheese is melted.