1. For deeper flavor bake whole sweet potatoes instead of boiling then scoop and mash 2. use evaporated milk or half and half for a richer texture 3. reduce sugar for a less sweet casserole or add 1 tbsp maple syrup for a caramel note 4. broil briefly at the end for faster toasting but watch closely 5. make ahead by baking without marshmallows then rewarm and add marshmallows just before serving