1. Stir the soup, milk, black pepper, red pepper, beans and 2/3 c. onions in a 1 1/2-quart casserole.
2. Bake at 350°F for 25 min. or until the bean mixture is hot and bubbling. Stir the bean mixture. Sprinkle with the remaining onions.
3. Bake for 5 min. or until the onions are golden brown.