Creating The Best Sweet Potato Casserole is straightforward with these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook the Sweet Potatoes: Boil the cubed sweet potatoes in a large pot of salted water for about 15-20 minutes or until fork-tender. Drain and let cool slightly.
3. Mash the Sweet Potatoes: In a large mixing bowl, mash the sweet potatoes until smooth.
4. Add Sugar and Spices: Stir in the granulated sugar, brown sugar, vanilla extract, milk, eggs, cinnamon, nutmeg, and salt until well combined.
5. Transfer to Baking Dish: Pour the sweet potato mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Prepare the Topping: In a separate bowl, mix the chopped nuts, crushed graham crackers, melted butter, and brown sugar until crumbly.
7. Add Topping: Evenly sprinkle the topping mixture over the sweet potato filling.
8. Add Marshmallows (Optional): If you like, sprinkle mini marshmallows on top for a gooey finish.
9. Bake: Place the dish in the preheated oven and bake for 30-35 minutes, or until the topping is golden brown and the casserole is heated through.
10. Cool and Serve: Once baked, remove from the oven and let cool for a few minutes before serving.

These simple steps will guide you in creating an incredible sweet potato casserole that is sure to impress everyone at your table.