Oh, this is a very controversial question, and one that many people have very different opinions on! Many consider sweet potatoes as a side dish, like mashed potatoes. However, when topped and baked with marshmallows or a brown sugar pecan crumble, it becomes very sweet, like a pumpkin pie, crumble or crisp. Many enjoy sweet potato casserole served with whipped cream or ice cream, thus making it a dessert. Either way it is served, it's absolutely delicious!