>Recipe courtesy of: CDKitchen
3 packages (9-oz. size) frozen French-style green beans
1 tablespoon butter or margarine
1 small onion, chopped
1 package (8-oz. size) sliced mushrooms
1 can (10 3/4-oz. size) cream of mushroom soup
1 can (8-oz. size) sliced water chestnuts, drained
1/4 teaspoon pepper
1 1/2 cup shredded Cheddar cheese
1 can (6-oz. size) French-fried onions
Cook green beans in microwave according to package directions. Place in large bowl; set aside.
Preheat oven to 375 degrees F.
Heat butter in large skillet over medium heat. Add onion and mushrooms, stirring about 5 minutes or until tender; add to green beans. Stir in mushroom soup and next 3 ingredients, mixing well.
Spoon half of green bean mixture into lightly greased 1 3/4-quart casserole; top with 1/2 of French-fried onions. Add remaining half of green bean mixture and top with remaining French-fried onions. Bake uncovered 20 minutes.