Green Bean Casserole with Mozzarella Cheese

These beans were served at Chris' cousin Keegan's graduation party. I loved them and had to get the recipe!

Ingrediants:
2 cans drained French cut green beans
8 ounces shredded Mozzarella cheese
2 tablespoons butter
2 tablespoons flour
2 teaspoons grated onion (Really great the onion - I tried powder and it wasn't the same!)
1 teaspoon salt
1/4 teaspoon pepper
1 teaspoon sugar
1 cup sour cream
1 cup crushed corn flakes, tossed with a few teaspoons of butter

Directions:
In a saucepan over medium low heat, melt butter. Add onion and cook for about 30 seconds. Stir in flour, salt, pepper and sugar; blend well and continue cooking and stirring until bubbly. Stir in sour cream and cook over low heat for about 1 minute. Spread beans over the botton of a buttered casserole (11x7x2 inch baking dish) Sprinkle shredded cheese over green beans then pour sauce evenly over; top with buttered corn flake crumbs. Bake green bean casserole at 400 degees for 20 minutes...Enjoy!