This sweet potato casserole is sprinkled with a nutty crumb topping to create a pleasantly crunchy contrast to the creamy and soft mashed sweet potatoes down below. The filling gets an extra special pumpkin pie(ish) treatment with brown sugar and vanilla for a deep caramel flavor. (In fact, leftovers can be heated up and topped with a scoop of ice cream just like pie.) Want to make ahead for Thanksgiving or another special holiday? Not a problem. The casserole ingredients can be mixed and transferred to a baking dish. Cover and refrigerate until ready to bake but leave off the topping. Store it separately at room temperature in an air-right container and sprinkle it on right before baking.
For an exceptionally smooth and creamy filling, ensure sweet potatoes are mashed thoroughly, perhaps even passing them through a food mill or ricer. To enhance the 'pumpkin pie' notes, consider adding a pinch of ground cinnamon or nutmeg to the sweet potato mixture. When making ahead, store the topping separately to prevent it from becoming soggy, and only sprinkle it on just before baking. This ensures a perfectly crunchy contrast to the soft filling. Serving warm is ideal, but leftovers are fantastic topped with a scoop of vanilla bean ice cream for a dessert-like experience.