Green Beans Cacerola

1/2 cup chopped onion
2 tablespoons butter
2 tablespoons flour
2 cups sour cream
32 ounces style green beans, seasoned
1/2 teaspoon salt
1/4 teaspoon pepper
1 cup shredded cheddar cheese

Brown onion in 2 tablespoons butter; add 2 tablespoons flour. Mix well.

Add sour cream and stir until it is mixed well. Drain water off green beans; put in large bowl. Pour mixture over green beans; salt and pepper.

Stir. Pour in baking dish; add shredded cheese over top. Bake at 350 F. for 30 minutes.