Just the name of this recipe is incentive enough to get in the kitchen and get baking. Bananas have an affinity for warming spices, including the cardamom that's mixed into the batter and especially the cinnamon that's sprinkled over the layers of sliced bananas in assembling the cake. Be sure to buy ripe bananas for the best flavor and texture. Whisked egg whites give the batter loft, so you end up with airy cake and tender bananas in every slice. Serve at a leisurely brunch or as dessert -- anytime you are enjoying a cup of coffee, in other words.