In mixing bowl, mix well the soup, pepper, soy sauce and milk. Stir in mushrooms and 1 1/2 cups french fried onions. Fold in green beans. Pour into 2 1/2 qt. casserole dish. Bake, uncovered, in 350 degree oven for 45 minutes to one hour or til hot and bubbly. Remove from oven, top with remaining onions and bake 5 minutes longer. Serve warm.