For an extra smooth texture, use an immersion blender to puree the sweet potatoes directly in the slow cooker. The spicy pecan topping can be made up to 3 weeks in advance and stored in an airtight container at room temperature. This makes it a great make-ahead element for holiday meals. Adjust the amount of cayenne pepper in the pecan topping to suit your spice preference. A pinch of smoked paprika can also be added for extra depth of flavor. For a vegan version, substitute the butter with a plant-based butter alternative and the heavy cream with coconut cream or other plant-based cream.