Mix soup, milk and pepper in a 1 1/2 -qt. baking dish. Stir in beans, mushrooms and 2/3 cup French Fried Onions.
Bake at 350 degrees for 30 minutes or until hot. Stir. Top with remaining 2/3 cup onions. Bake 5 min. until onions are golden.
Cook's Note: You may substitute 2 cans (14 1/2 oz.) cut green beans, drained OR 4 cups fresh, cooked cut green beans for frozen beans. You may also substitute cream of chicken soup for cream of mushroom. Try adding chopped water chestnuts for added crunch.