Butter + Salt + Pepper. This simple topping allows the natural flavor of the sweet potato to really shine. Butter + Brown Sugar + Cinnamon. This is another easy topping that adds small amount of added sugar and warmth. Butter, + Brown Sugar + Cinnamon + Marshmallows. This takes your baked sweet potato to a whole new level! Not only is it sweet with warm spices but it has extra sweetness, flavor, and texture from the toasted marshmallows.