The Classic Sweet Potato Casserole, a Thanksgiving essential, consists of velvety, buttery mashed sweet potatoes paired with maple syrup, eggs, and a crispy pecan streusel topping.
Bring a large pot of water to a boil (no need to salt). Add the sweet potatoes and cook until soft and very tender, 20 to 25 minutes. Drain and let cool.
Melt the butter in a medium bowl in the microwave. (Alternatively, melt it in a small pan over low heat and transfer to a medium bowl.)
Add the brown sugar, flour, and cinnamon and mix until well combined. It should look a little clumpy. Stir in the chopped nuts and set aside.