Green Bean Casserole

This was a new recipe for me. Normally my mom and I make green bean casserole a little differently, but I wanted to give something different a try! I made this for my office Christmas party last night, and I think everyone seemed to approve of this dish.

Vegetable cooking spray
1/4 cup finely chopped onion
2 tablespoons all-purpose flour
1 cup skim milk
1/2 cup (2 ounces) shredded reduced-fat Swiss cheese
1/2 cup low-fat sour cream
1 teaspoon sugar
1/2 teaspoon salt
2 (9-ounce) packages frozen French-style green beans, thawed and drained
1 1/2 cups herb-seasoned stuffing mix
2 teaspoons margarine, melted
1 egg white, lightly beaten

Coat a medium saucepan with cooking spray, and place over medium heat until hot. Add onion; saute 5 minutes or until tender. Add flour, and cook 1 minute, stirring constantly. Gradually add the milk, stirring until blended. Stir in cheese, sour cream, sugar, and salt; cook 5 minutes or until thickened and bubbly, stirring constantly.

Place green beans in an 8-inch square baking dish; pour the sauce over beans. Combine stuffing mix, margarine, and egg white in a bowl; stir well, and sprinkle over green bean mixture. Bake at 350° for 25 minutes or until thoroughly heated.