French Onion Soup

Preheat broiler. Meanwhile, coat a medium saucepan with cooking spray; sauté onion in saucepan until tender, about 3 minutes. Add broth to saucepan and heat through. Pour soup into a 2-cup ovenproof bowl and place potato slice over soup; top with slice of cheese. Place bowl on small baking sheet. Broil soup 4 inches from heat source for 1 minute or until cheese melts. (TIME-SAVER TIP: Making this Core-friendly soup is a snap if you bring home a baked potato, or part of one, from a restaurant or salad bar.)