1. Preheat oven to 350°. Stir together white sauce and green beans. Place mixture in a lightly greased 13- x 9-inch or 3-qt. baking dish.
2. Combine French fried onions and breadcrumbs. Sprinkle over green bean mixture.
3. Bake at 350° for 25 to 30 minutes or until golden brown and bubbly. Serve immediately.
Note: For testing purposes only, we used French's French Fried Onions.