Stir the soup, milk, mustard, broccoli and cheese in a 1 1/2-quart casserole.
Mix the bread crumbs with the butter in a small bowl and sprinkle over the broccoli mixture.
Bake at 350°F. for 30 minutes or until hot.
Rice Is Nice: Add 2 cups cooked white rice to the broccoli mixture.
Cheese Change-Up: Use mozzarella cheese for Cheddar.