Stir the soup, milk, lemon juice, broccoli and 2/3 cup onions in a 1 1/2-quart casserole. Cover the casserole.
Bake at 350°F. for 25 minutes or until the broccoli is tender. Stir the broccoli mixture. Sprinkle with the remaining onions.
Bake, uncovered, for 5 minutes or until the onions are golden brown.
Tip: To thaw the broccoli, microwave on HIGH for 3 minutes.