The phrase "sweet potato filling" refers to a dish made with cooked sweet potatoes that have been mashed, pureed or whipped into a smooth consistency. This mixture can be used as a filling for various baked goods such as pies, tarts and pastries, or it can also be served as a side dish on its own. The flavor of the sweet potato is typically sweetened with sugar or other natural sweeteners like maple syrup, honey or molasses to create a rich and creamy texture that complements both savory and sweet ingredients.