Grease a 3 quart rectangular baking dish; set aside.In small bowl gently toss bananas with lemon juice.Arrange half the bread slices in the bottom of the baking dish. Top bread with a layer of bananas.Add remaining bread slices.
In a medium bowl combine eggs, milk, honey, vanilla and cinnamon. Slowly pour egg mixture over french bread to coat evenly . Press bread down lightly with the back of a spoon to moisten all the bread. Cover and refrigerate 8 to 24 hours.
Before baking sprinkle with walnuts and sugar. Bake uncovered for 30 to 35 minutes at 325°F . done when a knife inserted near center comes out clean. Top of bread should be light brown.Serve with maple syrup.