Pierce carton of spinach. Place in microwave oven. Microwave at high (100%) 7 minutes. Carefully open carton and drain. Stir in salt, pepper and minced onion. Place spinach in a 1 1/2 quart casserole. Place sliced eggs over spinach. Set aside. Place butter in a small bowl. Microwave at high (100%) until melted, 30 to 45 seconds. Stir in flour, salt, pepper and dry mustard. Blend in milk and Worcestershire sauce. Microwave at medium high (70%) until thickened, 4 to 5 minutes, stirring twice during cooking time. Stir in cheese. Pour sauce over eggs and spinach. Sprinkle bread crumbs on top. Cover with wax paper. Microwave at medium high (70%) until heated through, 4 to 5 minutes. Makes 6 servings.