1. Use very ripe bananas for best flavor but slice just before layering to limit browning 2. substitute 2 cups half-and-half plus 1 cup whole milk for a richer custard 3. for a shortcut use 1 5.1 oz box instant vanilla pudding mix plus 3 cups cold milk and fold in 8 oz whipped topping then chill 4 hours 4. chill time is essential for wafers to soften and layers to set