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.
Achieving a perfectly creamy sweet potato base is key; ensure sweet potatoes are cooked until very tender before mashing, perhaps even using a ricer for ultimate smoothness. For deeper flavor in the filling, consider adding a pinch of ground cinnamon or nutmeg to complement the brown sugar and vanilla. The crumb topping's texture is crucial, so ensure it's evenly distributed for a balanced crunch in every bite. When making ahead, store the topping separately to prevent it from becoming soggy, sprinkling just before baking. This dish excels warm, but don't hesitate to serve leftovers topped with a scoop of vanilla bean ice cream for a delightful dessert.