1Heat squash, apples, onion, applesauce, apple juice, nutmeg, red pepper and 1 cup of the broth to boiling in 3-quart saucepan, stirring occasionally; reduce heat. Cover and simmer 20 minutes.
2Place squash mixture in blender or food processor. Cover and blend on medium speed until smooth; return mixture to saucepan. Stir in lentils and remaining broth. Heat to boiling; reduce heat. Cover and simmer 25 to 30 minutes, stirring occasionally, until lentils are tender.
3Set oven control to broil. Sprinkle cheese on bread slices. Place on rack in broiler pan. Broil bread with tops 3 inches from heat about 2 minutes or until cheese is bubbly. Top each serving of soup with slice of cheese bread and chopped onion.